3.9=r/8

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Solution for 3.9=r/8 equation: 



3.9=r/8

We move all terms to the left:

3.9-(r/8)=0

We add all the numbers together, and all the variables

-(+r/8)+3.9=0

We get rid of parentheses

-r/8+3.9=0

We multiply all the terms by the denominator


-r+(3.9)*8=0

We add all the numbers together, and all the variables

-1r+31.2=0

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

-r=-31.2

r=-31.2/-1

r=31+0.2/1

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