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-12=-13x-9x
We move all terms to the left:
-12-(-13x-9x)=0
We add all the numbers together, and all the variables
-(-22x)-12=0
We get rid of parentheses
22x-12=0
We move all terms containing x to the left, all other terms to the right
22x=12
x=12/22
x=6/11
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