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84x-108=12(7x-9)
We move all terms to the left:
84x-108-(12(7x-9))=0
We calculate terms in parentheses: -(12(7x-9)), so:We get rid of parentheses
12(7x-9)
We multiply parentheses
84x-108
Back to the equation:
-(84x-108)
84x-84x+108-108=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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