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r/4=0.75
We move all terms to the left:
r/4-(0.75)=0
We add all the numbers together, and all the variables
r/4-0.75=0
We multiply all the terms by the denominator
r-(0.75)*4=0
We add all the numbers together, and all the variables
r-3=0
We move all terms containing r to the left, all other terms to the right
r=3
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