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-9.4r=-171.08
We move all terms to the left:
-9.4r-(-171.08)=0
We add all the numbers together, and all the variables
-9.4r+171.08=0
We move all terms containing r to the left, all other terms to the right
-9.4r=-171.08
r=-171.08/-9.4
r=18+1/5
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