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3x-(x+8)=-10
We move all terms to the left:
3x-(x+8)-(-10)=0
We add all the numbers together, and all the variables
3x-(x+8)+10=0
We get rid of parentheses
3x-x-8+10=0
We add all the numbers together, and all the variables
2x+2=0
We move all terms containing x to the left, all other terms to the right
2x=-2
x=-2/2
x=-1
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