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-87=-3(6x-1)
We move all terms to the left:
-87-(-3(6x-1))=0
We calculate terms in parentheses: -(-3(6x-1)), so:We get rid of parentheses
-3(6x-1)
We multiply parentheses
-18x+3
Back to the equation:
-(-18x+3)
18x-3-87=0
We add all the numbers together, and all the variables
18x-90=0
We move all terms containing x to the left, all other terms to the right
18x=90
x=90/18
x=5
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