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900-x=2(x-450)
We move all terms to the left:
900-x-(2(x-450))=0
We add all the numbers together, and all the variables
-1x-(2(x-450))+900=0
We calculate terms in parentheses: -(2(x-450)), so:We get rid of parentheses
2(x-450)
We multiply parentheses
2x-900
Back to the equation:
-(2x-900)
-1x-2x+900+900=0
We add all the numbers together, and all the variables
-3x+1800=0
We move all terms containing x to the left, all other terms to the right
-3x=-1800
x=-1800/-3
x=+600
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