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-13=x/20
We move all terms to the left:
-13-(x/20)=0
We add all the numbers together, and all the variables
-(+x/20)-13=0
We get rid of parentheses
-x/20-13=0
We multiply all the terms by the denominator
-x-13*20=0
We add all the numbers together, and all the variables
-1x-260=0
We move all terms containing x to the left, all other terms to the right
-x=260
x=260/-1
x=-260
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