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13x=-12x+100
We move all terms to the left:
13x-(-12x+100)=0
We get rid of parentheses
13x+12x-100=0
We add all the numbers together, and all the variables
25x-100=0
We move all terms containing x to the left, all other terms to the right
25x=100
x=100/25
x=4
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