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15x-5=2x+20
We move all terms to the left:
15x-5-(2x+20)=0
We get rid of parentheses
15x-2x-20-5=0
We add all the numbers together, and all the variables
13x-25=0
We move all terms containing x to the left, all other terms to the right
13x=25
x=25/13
x=1+12/13
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