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8=3x+7(-x-16)
We move all terms to the left:
8-(3x+7(-x-16))=0
We add all the numbers together, and all the variables
-(3x+7(-1x-16))+8=0
We calculate terms in parentheses: -(3x+7(-1x-16)), so:We get rid of parentheses
3x+7(-1x-16)
We multiply parentheses
3x-7x-112
We add all the numbers together, and all the variables
-4x-112
Back to the equation:
-(-4x-112)
4x+112+8=0
We add all the numbers together, and all the variables
4x+120=0
We move all terms containing x to the left, all other terms to the right
4x=-120
x=-120/4
x=-30
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