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-12x+64=-8(2x+9)
We move all terms to the left:
-12x+64-(-8(2x+9))=0
We calculate terms in parentheses: -(-8(2x+9)), so:We get rid of parentheses
-8(2x+9)
We multiply parentheses
-16x-72
Back to the equation:
-(-16x-72)
-12x+16x+72+64=0
We add all the numbers together, and all the variables
4x+136=0
We move all terms containing x to the left, all other terms to the right
4x=-136
x=-136/4
x=-34
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