15=3(12-x)

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Solution for 15=3(12-x) equation: 



15=3(12-x)

We move all terms to the left:

15-(3(12-x))=0

We add all the numbers together, and all the variables

-(3(-1x+12))+15=0



We calculate terms in parentheses: -(3(-1x+12)), so:

3(-1x+12)

We multiply parentheses

-3x+36

Back to the equation:

-(-3x+36)



We get rid of parentheses

3x-36+15=0

We add all the numbers together, and all the variables

3x-21=0

We move all terms containing x to the left, all other terms to the right

3x=21

x=21/3

x=7

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