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21(r-937)=588
We move all terms to the left:
21(r-937)-(588)=0
We multiply parentheses
21r-19677-588=0
We add all the numbers together, and all the variables
21r-20265=0
We move all terms containing r to the left, all other terms to the right
21r=20265
r=20265/21
r=965
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