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9=15+8x
We move all terms to the left:
9-(15+8x)=0
We add all the numbers together, and all the variables
-(8x+15)+9=0
We get rid of parentheses
-8x-15+9=0
We add all the numbers together, and all the variables
-8x-6=0
We move all terms containing x to the left, all other terms to the right
-8x=6
x=6/-8
x=-3/4
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