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-13=x/13
We move all terms to the left:
-13-(x/13)=0
We add all the numbers together, and all the variables
-(+x/13)-13=0
We get rid of parentheses
-x/13-13=0
We multiply all the terms by the denominator
-x-13*13=0
We add all the numbers together, and all the variables
-1x-169=0
We move all terms containing x to the left, all other terms to the right
-x=169
x=169/-1
x=-169
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