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XX6+135=XX16-5
We move all terms to the left:
XX6+135-(XX16-5)=0
We get rid of parentheses
XX6-XX16+5+135=0
We add all the numbers together, and all the variables
XX6-XX16+140=0
We move all terms containing X to the left, all other terms to the right
XX6-XX16=-140
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