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900=8x-(2.5x+80)
We move all terms to the left:
900-(8x-(2.5x+80))=0
We calculate terms in parentheses: -(8x-(2.5x+80)), so:We get rid of parentheses
8x-(2.5x+80)
We get rid of parentheses
8x-2.5x-80
We add all the numbers together, and all the variables
5.5x-80
Back to the equation:
-(5.5x-80)
-5.5x+80+900=0
We add all the numbers together, and all the variables
-5.5x+980=0
We move all terms containing x to the left, all other terms to the right
-5.5x=-980
x=-980/-5.5
x=178+1/5.5
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