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15x-31=2x+4
We move all terms to the left:
15x-31-(2x+4)=0
We get rid of parentheses
15x-2x-4-31=0
We add all the numbers together, and all the variables
13x-35=0
We move all terms containing x to the left, all other terms to the right
13x=35
x=35/13
x=2+9/13
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