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45=3r+6
We move all terms to the left:
45-(3r+6)=0
We get rid of parentheses
-3r-6+45=0
We add all the numbers together, and all the variables
-3r+39=0
We move all terms containing r to the left, all other terms to the right
-3r=-39
r=-39/-3
r=+13
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