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-13=5+x-15
We move all terms to the left:
-13-(5+x-15)=0
We add all the numbers together, and all the variables
-(x-10)-13=0
We get rid of parentheses
-x+10-13=0
We add all the numbers together, and all the variables
-1x-3=0
We move all terms containing x to the left, all other terms to the right
-x=3
x=3/-1
x=-3
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