# (6x-8) - (5x+9) =3solve for x

*print*Print*list*Cite

### 4 Answers

grumpybear -- You know how to do the distributive property I would assume . . so you will use it to get rid of the paratheses in the problem.

Is there anything in front of the first set of ()'s? This would make them a little unneccessary . . so just drop them.

Now in front of the second set is only a - . . .think of this as a -1 (because there is always an invisible 1 if there is nothing in that spot, right?) So, distribute the -1 into the second set of ()'s. Now you will have . . .

6x - 8 - 5x - 9 = 3 --> *{-1(5x) + -1(9) = -5x - 9}*

from here, combine like terms (x's with other x's & #'s with other #'s) on the same side of the equal sign.

6x - 5x = 1x or just x *(there's the invisible 1 again)*

-8 - 9 = -17

so . .

x - 17 = 3 This is looking a little easier to handle right!

+17 +17 add 17 to both sides to cancel it from the x

x = 20

Distributing the negative problems (like this one) can be a little tricky. Remember to check your answers to make sure you are right . . .use your calculator to make it quick and easy to check . . .

(6*20 - 8) - (5*20 + 9) = ?

(112) - (109) = 3

(6x-8) - (5x+9) = 3 (open brackets)

6x - 8 - 5x - 9 =3

x - 8 - 9 =3 (subtract)

x - 17 = 3

x - 17 + 17 = 3 + 17 (adding 17 on both sides)

**x = 20 Answer **

You can verify it by plugging the value of x in the above equation.

This is an equation in one variable x. Such equations could be solved by simple operations like, adding equal quantity or subtracting equal quantity , mutiplying or dividing by equal quantity both sides.(But remember we do not divide by zero)

(6x-8)-(5x+9)=3

Open the bracket.There is no difficulty in opening the first bracket as it does not change contents inside the bracket. While opening the second bracket see that - sign outside acts as mutiplication by (-1) and is distributive over the terms 5x and 9 inside the bracket.

6x-8-1(5x)-1(9)=3

6x-8-5x-9=3.

Collect similar or like terms.

6x-5x-8-9=3

Simplify.

x-17=3

Add 17 to both sides.

x-17+17=3+17

**x=20**

Now verify whether x=20 satisfies the given equation:

Left side: (6*20-8)-(5*20-9) =(120-8)-(100+9)=112-109=3.

Right side:3.

(6x - 8) - (5x + 9) = 3

Removing the brackets in the equation we get:

6x - 8 - 5x - 9 = 3

Therefore: x - 17 = 3

Adding 17 to both sides of equation we get:

x = 3 + 17 = 20