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5XX+3=8XX+12
We move all terms to the left:
5XX+3-(8XX+12)=0
We get rid of parentheses
5XX-8XX-12+3=0
We add all the numbers together, and all the variables
5XX-8XX-9=0
We move all terms containing X to the left, all other terms to the right
5XX-8XX=9
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