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4(r-1)=2r+8
We move all terms to the left:
4(r-1)-(2r+8)=0
We multiply parentheses
4r-(2r+8)-4=0
We get rid of parentheses
4r-2r-8-4=0
We add all the numbers together, and all the variables
2r-12=0
We move all terms containing r to the left, all other terms to the right
2r=12
r=12/2
r=6
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