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13-2.5x=3x-15
We move all terms to the left:
13-2.5x-(3x-15)=0
We get rid of parentheses
-2.5x-3x+15+13=0
We add all the numbers together, and all the variables
-5.5x+28=0
We move all terms containing x to the left, all other terms to the right
-5.5x=-28
x=-28/-5.5
x=5+0.5/5.5
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