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3(r+5)=4r
We move all terms to the left:
3(r+5)-(4r)=0
We add all the numbers together, and all the variables
-4r+3(r+5)=0
We multiply parentheses
-4r+3r+15=0
We add all the numbers together, and all the variables
-1r+15=0
We move all terms containing r to the left, all other terms to the right
-r=-15
r=-15/-1
r=+15
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