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12x-13=-13x-1
We move all terms to the left:
12x-13-(-13x-1)=0
We get rid of parentheses
12x+13x+1-13=0
We add all the numbers together, and all the variables
25x-12=0
We move all terms containing x to the left, all other terms to the right
25x=12
x=12/25
x=12/25
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