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-6+x=-8x-15
We move all terms to the left:
-6+x-(-8x-15)=0
We get rid of parentheses
x+8x+15-6=0
We add all the numbers together, and all the variables
9x+9=0
We move all terms containing x to the left, all other terms to the right
9x=-9
x=-9/9
x=-1
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