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-3+5x=2x+15
We move all terms to the left:
-3+5x-(2x+15)=0
We get rid of parentheses
5x-2x-15-3=0
We add all the numbers together, and all the variables
3x-18=0
We move all terms containing x to the left, all other terms to the right
3x=18
x=18/3
x=6
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