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x+12=7x-(4x-4)
We move all terms to the left:
x+12-(7x-(4x-4))=0
We calculate terms in parentheses: -(7x-(4x-4)), so:We get rid of parentheses
7x-(4x-4)
We get rid of parentheses
7x-4x+4
We add all the numbers together, and all the variables
3x+4
Back to the equation:
-(3x+4)
x-3x-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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