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-7x-15=-15x+9
We move all terms to the left:
-7x-15-(-15x+9)=0
We get rid of parentheses
-7x+15x-9-15=0
We add all the numbers together, and all the variables
8x-24=0
We move all terms containing x to the left, all other terms to the right
8x=24
x=24/8
x=3
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