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13-3x=4x-15
We move all terms to the left:
13-3x-(4x-15)=0
We get rid of parentheses
-3x-4x+15+13=0
We add all the numbers together, and all the variables
-7x+28=0
We move all terms containing x to the left, all other terms to the right
-7x=-28
x=-28/-7
x=+4
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