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4x+13=12x-39
We move all terms to the left:
4x+13-(12x-39)=0
We get rid of parentheses
4x-12x+39+13=0
We add all the numbers together, and all the variables
-8x+52=0
We move all terms containing x to the left, all other terms to the right
-8x=-52
x=-52/-8
x=6+1/2
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