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-12-5-9+4x=8x-13x+15-8
We move all terms to the left:
-12-5-9+4x-(8x-13x+15-8)=0
We add all the numbers together, and all the variables
4x-(-5x+7)-12-5-9=0
We add all the numbers together, and all the variables
4x-(-5x+7)-26=0
We get rid of parentheses
4x+5x-7-26=0
We add all the numbers together, and all the variables
9x-33=0
We move all terms containing x to the left, all other terms to the right
9x=33
x=33/9
x=3+2/3
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