x+2x+12x=81

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baxthum8's profile pic

baxthum8 | High School Teacher | (Level 3) Associate Educator

Posted on

`x + 2x + 12x = 81`

Combine like terms.

`15x = 81`

Divide both sides by 15.

`(15x)/15 = 81/15`

` ` `x = 81/15`

Reduce your answer by factor of 3.

`x = 27/5` or `x = 5.4`     `lArr` The solution

zumba96's profile pic

zumba96 | Student, Grade 11 | (Level 3) Valedictorian

Posted on

Isolate the variable

x+2x+12x=81

Since all the variables are on one side simply add them up

15x=81

Divide by 15

x=5.4

jess1999's profile pic

jess1999 | Student, Grade 9 | (Level 1) Valedictorian

Posted on

x + 2x + 12x = 81

First combine the like terms ( 2x and 12x and x )

By combining the like terms , your equation should look like

15x = 81 now divide both sides by 15 to get " x " alone

By dividing both sides by 15 , your equation should be

x = 81/15 simplify it to

x = 27/5 which is your answer

atyourservice's profile pic

atyourservice | Student, Grade 11 | (Level 3) Valedictorian

Posted on

`x+2x+12x=81 `

combine like terms
`15x=81`
 
solve for x by dividing by 15
`(15x)/ (15) = (81)/(15)`
 
x=5.4
amysor's profile pic

amysor | Student, Grade 10 | (Level 1) Valedictorian

Posted on

First of all you have to combine like terms

x+2x+12x=81.

15x=81

Divide by 15 to isolate x.

15x=81/15   =      x=5.4 

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