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648=9(6x+18)
We move all terms to the left:
648-(9(6x+18))=0
We calculate terms in parentheses: -(9(6x+18)), so:We get rid of parentheses
9(6x+18)
We multiply parentheses
54x+162
Back to the equation:
-(54x+162)
-54x-162+648=0
We add all the numbers together, and all the variables
-54x+486=0
We move all terms containing x to the left, all other terms to the right
-54x=-486
x=-486/-54
x=+9
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