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-r3.85=1.15
We move all terms to the left:
-r3.85-(1.15)=0
We add all the numbers together, and all the variables
-r3.85-1.15=0
We move all terms containing r to the left, all other terms to the right
-r3.85=1.15
r=1.15/1
r=1.15
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