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92=5r-13
We move all terms to the left:
92-(5r-13)=0
We get rid of parentheses
-5r+13+92=0
We add all the numbers together, and all the variables
-5r+105=0
We move all terms containing r to the left, all other terms to the right
-5r=-105
r=-105/-5
r=+21
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