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49=4r+9
We move all terms to the left:
49-(4r+9)=0
We get rid of parentheses
-4r-9+49=0
We add all the numbers together, and all the variables
-4r+40=0
We move all terms containing r to the left, all other terms to the right
-4r=-40
r=-40/-4
r=+10
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