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15+12=-3(2x-9)
We move all terms to the left:
15+12-(-3(2x-9))=0
We add all the numbers together, and all the variables
-(-3(2x-9))+27=0
We calculate terms in parentheses: -(-3(2x-9)), so:We get rid of parentheses
-3(2x-9)
We multiply parentheses
-6x+27
Back to the equation:
-(-6x+27)
6x-27+27=0
We add all the numbers together, and all the variables
6x=0
x=0/6
x=0
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