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12+9x=11x-8
We move all terms to the left:
12+9x-(11x-8)=0
We get rid of parentheses
9x-11x+8+12=0
We add all the numbers together, and all the variables
-2x+20=0
We move all terms containing x to the left, all other terms to the right
-2x=-20
x=-20/-2
x=+10
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