78.5=31.4*r

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Solution for 78.5=31.4*r equation: 



78.5=31.4r

We move all terms to the left:

78.5-(31.4r)=0

We add all the numbers together, and all the variables

-(+31.4r)+78.5=0

We get rid of parentheses

-31.4r+78.5=0

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

-31.4r=-78.5

r=-78.5/-31.4

r=2+9.235294117647/18.470588235294

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