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6x-13=4x+12
We move all terms to the left:
6x-13-(4x+12)=0
We get rid of parentheses
6x-4x-12-13=0
We add all the numbers together, and all the variables
2x-25=0
We move all terms containing x to the left, all other terms to the right
2x=25
x=25/2
x=12+1/2
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