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3.92=xx20+2xx18
We move all terms to the left:
3.92-(xx20+2xx18)=0
We add all the numbers together, and all the variables
-(+xx20+2xx18)+3.92=0
We get rid of parentheses
-xx20-2xx18+3.92=0
We move all terms containing x to the left, all other terms to the right
-xx20-2xx18=-3.92
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