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87=-3(-6x-5)
We move all terms to the left:
87-(-3(-6x-5))=0
We calculate terms in parentheses: -(-3(-6x-5)), so:We get rid of parentheses
-3(-6x-5)
We multiply parentheses
18x+15
Back to the equation:
-(18x+15)
-18x-15+87=0
We add all the numbers together, and all the variables
-18x+72=0
We move all terms containing x to the left, all other terms to the right
-18x=-72
x=-72/-18
x=+4
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