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-8x-8=-7x-9
We move all terms to the left:
-8x-8-(-7x-9)=0
We get rid of parentheses
-8x+7x+9-8=0
We add all the numbers together, and all the variables
-1x+1=0
We move all terms containing x to the left, all other terms to the right
-x=-1
x=-1/-1
x=1
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