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12(1x-12)=9(1+7x)
We move all terms to the left:
12(1x-12)-(9(1+7x))=0
We add all the numbers together, and all the variables
12(x-12)-(9(7x+1))=0
We multiply parentheses
12x-(9(7x+1))-144=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)
12x-63x-9-144=0
We add all the numbers together, and all the variables
-51x-153=0
We move all terms containing x to the left, all other terms to the right
-51x=153
x=153/-51
x=-3
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