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-2.73r=0.42
We move all terms to the left:
-2.73r-(0.42)=0
We add all the numbers together, and all the variables
-2.73r-0.42=0
We move all terms containing r to the left, all other terms to the right
-2.73r=0.42
r=0.42/-2.73
r=-0.42/2.73
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