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1.64(r-6)=3.28
We move all terms to the left:
1.64(r-6)-(3.28)=0
We add all the numbers together, and all the variables
1.64(r-6)-3.28=0
We multiply parentheses
1.64r-9.84-3.28=0
We add all the numbers together, and all the variables
1.64r-13.12=0
We move all terms containing r to the left, all other terms to the right
1.64r=13.12
r=13.12/1.64
r=8
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