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-9+4x=x+15
We move all terms to the left:
-9+4x-(x+15)=0
We get rid of parentheses
4x-x-15-9=0
We add all the numbers together, and all the variables
3x-24=0
We move all terms containing x to the left, all other terms to the right
3x=24
x=24/3
x=8
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