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10=r+3.75
We move all terms to the left:
10-(r+3.75)=0
We get rid of parentheses
-r-3.75+10=0
We add all the numbers together, and all the variables
-1r+6.25=0
We move all terms containing r to the left, all other terms to the right
-r=-6.25
r=-6.25/-1
r=6+0.25/1
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