12=3(x-1)-(x-7)

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Solution for 12=3(x-1)-(x-7) equation: 



12=3(x-1)-(x-7)

We move all terms to the left:

12-(3(x-1)-(x-7))=0



We calculate terms in parentheses: -(3(x-1)-(x-7)), so:

3(x-1)-(x-7)

We multiply parentheses

3x-(x-7)-3

We get rid of parentheses

3x-x+7-3

We add all the numbers together, and all the variables

2x+4

Back to the equation:

-(2x+4)



We get rid of parentheses

-2x-4+12=0

We add all the numbers together, and all the variables

-2x+8=0

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

-2x=-8

x=-8/-2

x=+4

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