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12+2x+-x=9x+6
We move all terms to the left:
12+2x+-x-(9x+6)=0
We add all the numbers together, and all the variables
x-(9x+6)=0
We get rid of parentheses
x-9x-6=0
We add all the numbers together, and all the variables
-8x-6=0
We move all terms containing x to the left, all other terms to the right
-8x=6
x=6/-8
x=-3/4
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