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11x+9-8x=x-15
We move all terms to the left:
11x+9-8x-(x-15)=0
We add all the numbers together, and all the variables
3x-(x-15)+9=0
We get rid of parentheses
3x-x+15+9=0
We add all the numbers together, and all the variables
2x+24=0
We move all terms containing x to the left, all other terms to the right
2x=-24
x=-24/2
x=-12
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