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6r+2.5=90r+1
We move all terms to the left:
6r+2.5-(90r+1)=0
We get rid of parentheses
6r-90r-1+2.5=0
We add all the numbers together, and all the variables
-84r+1.5=0
We move all terms containing r to the left, all other terms to the right
-84r=-1.5
r=-1.5/-84
r=1/56
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