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870=5(x+18)
We move all terms to the left:
870-(5(x+18))=0
We calculate terms in parentheses: -(5(x+18)), so:We get rid of parentheses
5(x+18)
We multiply parentheses
5x+90
Back to the equation:
-(5x+90)
-5x-90+870=0
We add all the numbers together, and all the variables
-5x+780=0
We move all terms containing x to the left, all other terms to the right
-5x=-780
x=-780/-5
x=+156
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