r+3.1=7.5

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Solution for r+3.1=7.5 equation: 



r+3.1=7.5

We move all terms to the left:

r+3.1-(7.5)=0

We add all the numbers together, and all the variables

r-4.4=0

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

r=4.4

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