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18=9-(3-x)
We move all terms to the left:
18-(9-(3-x))=0
We add all the numbers together, and all the variables
-(9-(-1x+3))+18=0
We calculate terms in parentheses: -(9-(-1x+3)), so:We get rid of parentheses
9-(-1x+3)
determiningTheFunctionDomain -(-1x+3)+9
We get rid of parentheses
1x-3+9
We add all the numbers together, and all the variables
x+6
Back to the equation:
-(x+6)
-x-6+18=0
We add all the numbers together, and all the variables
-1x+12=0
We move all terms containing x to the left, all other terms to the right
-x=-12
x=-12/-1
x=+12
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