8.7r=42.5

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Solution for 8.7r=42.5 equation: 



8.7r=42.5

We move all terms to the left:

8.7r-(42.5)=0

We add all the numbers together, and all the variables

8.7r-42.5=0

We move all terms containing r to the left, all other terms to the right

8.7r=42.5

r=42.5/8.7

r=4+4.5294117647059/5.1176470588235

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