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-13=x-3-3
We move all terms to the left:
-13-(x-3-3)=0
We add all the numbers together, and all the variables
-(x-6)-13=0
We get rid of parentheses
-x+6-13=0
We add all the numbers together, and all the variables
-1x-7=0
We move all terms containing x to the left, all other terms to the right
-x=7
x=7/-1
x=-7
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