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12x=-8(5-x)
We move all terms to the left:
12x-(-8(5-x))=0
We add all the numbers together, and all the variables
12x-(-8(-1x+5))=0
We calculate terms in parentheses: -(-8(-1x+5)), so:We get rid of parentheses
-8(-1x+5)
We multiply parentheses
8x-40
Back to the equation:
-(8x-40)
12x-8x+40=0
We add all the numbers together, and all the variables
4x+40=0
We move all terms containing x to the left, all other terms to the right
4x=-40
x=-40/4
x=-10
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