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220=r*44
We move all terms to the left:
220-(r*44)=0
We add all the numbers together, and all the variables
-(+r*44)+220=0
We get rid of parentheses
-r*44+220=0
Wy multiply elements
-44r+220=0
We move all terms containing r to the left, all other terms to the right
-44r=-220
r=-220/-44
r=+5
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