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-66+7x=49+12x
We move all terms to the left:
-66+7x-(49+12x)=0
We add all the numbers together, and all the variables
7x-(12x+49)-66=0
We get rid of parentheses
7x-12x-49-66=0
We add all the numbers together, and all the variables
-5x-115=0
We move all terms containing x to the left, all other terms to the right
-5x=115
x=115/-5
x=-23
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