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73=8+5r
We move all terms to the left:
73-(8+5r)=0
We add all the numbers together, and all the variables
-(5r+8)+73=0
We get rid of parentheses
-5r-8+73=0
We add all the numbers together, and all the variables
-5r+65=0
We move all terms containing r to the left, all other terms to the right
-5r=-65
r=-65/-5
r=+13
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