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4(-1+r)=32
We move all terms to the left:
4(-1+r)-(32)=0
We add all the numbers together, and all the variables
4(r-1)-32=0
We multiply parentheses
4r-4-32=0
We add all the numbers together, and all the variables
4r-36=0
We move all terms containing r to the left, all other terms to the right
4r=36
r=36/4
r=9
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