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2(10r-7)-2(1+10r=-7+2r
We move all terms to the left:
2(10r-7)-2(1+10r-(-7+2r)=0
We add all the numbers together, and all the variables
2(10r-7)-2(1+10r-(2r-7)=0
We multiply parentheses
20r-2(1+10r-(2r-7)-14=0
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