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11x-12+(-6)=13x+9
We move all terms to the left:
11x-12+(-6)-(13x+9)=0
We add all the numbers together, and all the variables
11x-(13x+9)-18=0
We get rid of parentheses
11x-13x-9-18=0
We add all the numbers together, and all the variables
-2x-27=0
We move all terms containing x to the left, all other terms to the right
-2x=27
x=27/-2
x=-13+1/2
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