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-70=-30+x
We move all terms to the left:
-70-(-30+x)=0
We add all the numbers together, and all the variables
-(x-30)-70=0
We get rid of parentheses
-x+30-70=0
We add all the numbers together, and all the variables
-1x-40=0
We move all terms containing x to the left, all other terms to the right
-x=40
x=40/-1
x=-40
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