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18x=9(x+200)
We move all terms to the left:
18x-(9(x+200))=0
We calculate terms in parentheses: -(9(x+200)), so:We get rid of parentheses
9(x+200)
We multiply parentheses
9x+1800
Back to the equation:
-(9x+1800)
18x-9x-1800=0
We add all the numbers together, and all the variables
9x-1800=0
We move all terms containing x to the left, all other terms to the right
9x=1800
x=1800/9
x=200
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