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3x-10=(x)x-20
We move all terms to the left:
3x-10-((x)x-20)=0
We get rid of parentheses
3x-xx+20-10=0
We add all the numbers together, and all the variables
3x-xx+10=0
We move all terms containing x to the left, all other terms to the right
3x-xx=-10
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