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