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900=(x+20)12
We move all terms to the left:
900-((x+20)12)=0
We calculate terms in parentheses: -((x+20)12), so:We get rid of parentheses
(x+20)12
We multiply parentheses
12x+240
Back to the equation:
-(12x+240)
-12x-240+900=0
We add all the numbers together, and all the variables
-12x+660=0
We move all terms containing x to the left, all other terms to the right
-12x=-660
x=-660/-12
x=+55
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