3(12-x)=15

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



3(12-x)=15

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply 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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