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Solve for the variable and check answer. A) x-3/5=1-x/3

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kim1246 | (Level 3) eNoter

Posted March 5, 2013 at 2:48 PM via iOS

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Solve for the variable and check answer. A) x-3/5=1-x/3

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durbanville | High School Teacher | (Level 1) Educator Emeritus

Posted March 5, 2013 at 3:01 PM (Answer #1)

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x is the variable (because it changes depending on the conditions - it varies).

`x-3/5 = 1- x/3`

Simplify the equation by removing the denominator:

LCD (lowest common denominator) is 15 (3x5 is the lowest):

`15(x) - 15(3/5) = 15 (1) - 15 (x/3)`

Note how the 15 cancels out the denominator in the `3/5 and x/5`

`therefore 15x - 9 = 15 - 5x`

Now solve:

15x + 5x = 15 + 9 (note the symbols)

`therefore 20x = 24`

`therefore x = 24/20`

Simplify (4 will go into both numerator and denominator):

`therefore x= 6/5 or 1 1/5`

Now to check, substitute the answer into your original equation:

`6/5 - 3/5 = 1- (6/5)/3`

It is difficult to understand the fraction which can therefore be written in a different format: 

`3/5= 1- (6/5 divide 3)`

`3/5 = 1- (6/5 times 1/3)`

`3/5= 1 - 2/5`

`therefore 3/5=3/5`

`x= 6/5 or 1 1/5`

`therefore` x= 6/5 or 1 1/5

 

 

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