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12-9x-13=11-7x
We move all terms to the left:
12-9x-13-(11-7x)=0
We add all the numbers together, and all the variables
-9x-(-7x+11)+12-13=0
We add all the numbers together, and all the variables
-9x-(-7x+11)-1=0
We get rid of parentheses
-9x+7x-11-1=0
We add all the numbers together, and all the variables
-2x-12=0
We move all terms containing x to the left, all other terms to the right
-2x=12
x=12/-2
x=-6
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