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38=5r-7
We move all terms to the left:
38-(5r-7)=0
We get rid of parentheses
-5r+7+38=0
We add all the numbers together, and all the variables
-5r+45=0
We move all terms containing r to the left, all other terms to the right
-5r=-45
r=-45/-5
r=+9
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