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-9=8x+15
We move all terms to the left:
-9-(8x+15)=0
We get rid of parentheses
-8x-15-9=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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