12=3x+7(x-4)

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Solution for 12=3x+7(x-4) equation: 



12=3x+7(x-4)

We move all terms to the left:

12-(3x+7(x-4))=0



We calculate terms in parentheses: -(3x+7(x-4)), so:

3x+7(x-4)

We multiply parentheses

3x+7x-28

We add all the numbers together, and all the variables

10x-28

Back to the equation:

-(10x-28)



We get rid of parentheses

-10x+28+12=0

We add all the numbers together, and all the variables

-10x+40=0

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

-10x=-40

x=-40/-10

x=+4

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