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12x-9+3x-4=11x-3+3
We move all terms to the left:
12x-9+3x-4-(11x-3+3)=0
We add all the numbers together, and all the variables
12x+3x-(+11x)-9-4=0
We add all the numbers together, and all the variables
15x-(+11x)-13=0
We get rid of parentheses
15x-11x-13=0
We add all the numbers together, and all the variables
4x-13=0
We move all terms containing x to the left, all other terms to the right
4x=13
x=13/4
x=3+1/4
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