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