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3x=4x-13
We move all terms to the left:
3x-(4x-13)=0
We get rid of parentheses
3x-4x+13=0
We add all the numbers together, and all the variables
-1x+13=0
We move all terms containing x to the left, all other terms to the right
-x=-13
x=-13/-1
x=+13
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