31.2=r*3.9

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Solution for 31.2=r*3.9 equation: 



31.2=r*3.9

We move all terms to the left:

31.2-(r*3.9)=0

We add all the numbers together, and all the variables

-(+r*3.9)+31.2=0

We get rid of parentheses

-r*3.9+31.2=0

Wy multiply elements

-3.9r+31.2=0

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

-3.9r=-31.2

r=-31.2/-3.9

r=+8

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