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90=2.50(x+5)
We move all terms to the left:
90-(2.50(x+5))=0
We calculate terms in parentheses: -(2.50(x+5)), so:We get rid of parentheses
2.50(x+5)
We multiply parentheses
2.5x+12.5
Back to the equation:
-(2.5x+12.5)
-2.5x-12.5+90=0
We add all the numbers together, and all the variables
-2.5x+77.5=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-77.5
x=-77.5/-2.5
x=+31
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