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45=10r+5
We move all terms to the left:
45-(10r+5)=0
We get rid of parentheses
-10r-5+45=0
We add all the numbers together, and all the variables
-10r+40=0
We move all terms containing r to the left, all other terms to the right
-10r=-40
r=-40/-10
r=+4
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