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XX7-12=XX2+8
We move all terms to the left:
XX7-12-(XX2+8)=0
We get rid of parentheses
XX7-XX2-8-12=0
We add all the numbers together, and all the variables
XX7-XX2-20=0
We move all terms containing X to the left, all other terms to the right
XX7-XX2=20
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