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-9=12x+2x
We move all terms to the left:
-9-(12x+2x)=0
We add all the numbers together, and all the variables
-(+14x)-9=0
We get rid of parentheses
-14x-9=0
We move all terms containing x to the left, all other terms to the right
-14x=9
x=9/-14
x=-9/14
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