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128=8x-3(-4x+4)
We move all terms to the left:
128-(8x-3(-4x+4))=0
We calculate terms in parentheses: -(8x-3(-4x+4)), so:We get rid of parentheses
8x-3(-4x+4)
We multiply parentheses
8x+12x-12
We add all the numbers together, and all the variables
20x-12
Back to the equation:
-(20x-12)
-20x+12+128=0
We add all the numbers together, and all the variables
-20x+140=0
We move all terms containing x to the left, all other terms to the right
-20x=-140
x=-140/-20
x=+7
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