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-12=9(1+7x)
We move all terms to the left:
-12-(9(1+7x))=0
We add all the numbers together, and all the variables
-(9(7x+1))-12=0
We calculate terms in parentheses: -(9(7x+1)), so:We get rid of parentheses
9(7x+1)
We multiply parentheses
63x+9
Back to the equation:
-(63x+9)
-63x-9-12=0
We add all the numbers together, and all the variables
-63x-21=0
We move all terms containing x to the left, all other terms to the right
-63x=21
x=21/-63
x=-1/3
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