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-13=3+x
We move all terms to the left:
-13-(3+x)=0
We add all the numbers together, and all the variables
-(x+3)-13=0
We get rid of parentheses
-x-3-13=0
We add all the numbers together, and all the variables
-1x-16=0
We move all terms containing x to the left, all other terms to the right
-x=16
x=16/-1
x=-16
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