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7x-4=12x+13
We move all terms to the left:
7x-4-(12x+13)=0
We get rid of parentheses
7x-12x-13-4=0
We add all the numbers together, and all the variables
-5x-17=0
We move all terms containing x to the left, all other terms to the right
-5x=17
x=17/-5
x=-3+2/5
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