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-87=-6x-3(-5x+8)
We move all terms to the left:
-87-(-6x-3(-5x+8))=0
We calculate terms in parentheses: -(-6x-3(-5x+8)), so:We get rid of parentheses
-6x-3(-5x+8)
We multiply parentheses
-6x+15x-24
We add all the numbers together, and all the variables
9x-24
Back to the equation:
-(9x-24)
-9x+24-87=0
We add all the numbers together, and all the variables
-9x-63=0
We move all terms containing x to the left, all other terms to the right
-9x=63
x=63/-9
x=-7
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