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