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20r+4=r-794
We move all terms to the left:
20r+4-(r-794)=0
We get rid of parentheses
20r-r+794+4=0
We add all the numbers together, and all the variables
19r+798=0
We move all terms containing r to the left, all other terms to the right
19r=-798
r=-798/19
r=-42
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