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-(10x+30)=100
We move all terms to the left:
-(10x+30)-(100)=0
We get rid of parentheses
-10x-30-100=0
We add all the numbers together, and all the variables
-10x-130=0
We move all terms containing x to the left, all other terms to the right
-10x=130
x=130/-10
x=-13
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