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-(15-x)=-30
We move all terms to the left:
-(15-x)-(-30)=0
We add all the numbers together, and all the variables
-(-1x+15)-(-30)=0
We add all the numbers together, and all the variables
-(-1x+15)+30=0
We get rid of parentheses
1x-15+30=0
We add all the numbers together, and all the variables
x+15=0
We move all terms containing x to the left, all other terms to the right
x=-15
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