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5(r+4)=55r=
We move all terms to the left:
5(r+4)-(55r)=0
We add all the numbers together, and all the variables
-55r+5(r+4)=0
We multiply parentheses
-55r+5r+20=0
We add all the numbers together, and all the variables
-50r+20=0
We move all terms containing r to the left, all other terms to the right
-50r=-20
r=-20/-50
r=2/5
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