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-x-12=2x-9
We move all terms to the left:
-x-12-(2x-9)=0
We add all the numbers together, and all the variables
-1x-(2x-9)-12=0
We get rid of parentheses
-1x-2x+9-12=0
We add all the numbers together, and all the variables
-3x-3=0
We move all terms containing x to the left, all other terms to the right
-3x=3
x=3/-3
x=-1
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