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-12+9x=x-12+9x=0
We move all terms to the left:
-12+9x-(x-12+9x)=0
We add all the numbers together, and all the variables
9x-(10x-12)-12=0
We get rid of parentheses
9x-10x+12-12=0
We add all the numbers together, and all the variables
-x=0
x=0/-1
x=0
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