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15x-217=-2x+55
We move all terms to the left:
15x-217-(-2x+55)=0
We get rid of parentheses
15x+2x-55-217=0
We add all the numbers together, and all the variables
17x-272=0
We move all terms containing x to the left, all other terms to the right
17x=272
x=272/17
x=16
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