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(5r+8)=90
We move all terms to the left:
(5r+8)-(90)=0
We get rid of parentheses
5r+8-90=0
We add all the numbers together, and all the variables
5r-82=0
We move all terms containing r to the left, all other terms to the right
5r=82
r=82/5
r=16+2/5
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