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3x+15=13x-13
We move all terms to the left:
3x+15-(13x-13)=0
We get rid of parentheses
3x-13x+13+15=0
We add all the numbers together, and all the variables
-10x+28=0
We move all terms containing x to the left, all other terms to the right
-10x=-28
x=-28/-10
x=2+4/5
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