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38+(r-41)=90
We move all terms to the left:
38+(r-41)-(90)=0
We add all the numbers together, and all the variables
(r-41)-52=0
We get rid of parentheses
r-41-52=0
We add all the numbers together, and all the variables
r-93=0
We move all terms containing r to the left, all other terms to the right
r=93
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