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4(r+3)=1
We move all terms to the left:
4(r+3)-(1)=0
We multiply parentheses
4r+12-1=0
We add all the numbers together, and all the variables
4r+11=0
We move all terms containing r to the left, all other terms to the right
4r=-11
r=-11/4
r=-2+3/4
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