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20=r+2-7r
We move all terms to the left:
20-(r+2-7r)=0
We add all the numbers together, and all the variables
-(-6r+2)+20=0
We get rid of parentheses
6r-2+20=0
We add all the numbers together, and all the variables
6r+18=0
We move all terms containing r to the left, all other terms to the right
6r=-18
r=-18/6
r=-3
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