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128=4x-2(7x-4)
We move all terms to the left:
128-(4x-2(7x-4))=0
We calculate terms in parentheses: -(4x-2(7x-4)), so:We get rid of parentheses
4x-2(7x-4)
We multiply parentheses
4x-14x+8
We add all the numbers together, and all the variables
-10x+8
Back to the equation:
-(-10x+8)
10x-8+128=0
We add all the numbers together, and all the variables
10x+120=0
We move all terms containing x to the left, all other terms to the right
10x=-120
x=-120/10
x=-12
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