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15+2x=4x-13
We move all terms to the left:
15+2x-(4x-13)=0
We get rid of parentheses
2x-4x+13+15=0
We add all the numbers together, and all the variables
-2x+28=0
We move all terms containing x to the left, all other terms to the right
-2x=-28
x=-28/-2
x=+14
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