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13x=x-20
We move all terms to the left:
13x-(x-20)=0
We get rid of parentheses
13x-x+20=0
We add all the numbers together, and all the variables
12x+20=0
We move all terms containing x to the left, all other terms to the right
12x=-20
x=-20/12
x=-1+2/3
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