4=3.1+r

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Solution for 4=3.1+r equation: 



4=3.1+r

We move all terms to the left:

4-(3.1+r)=0

We add all the numbers together, and all the variables

-(r+3.1)+4=0

We get rid of parentheses

-r-3.1+4=0

We add all the numbers together, and all the variables

-1r+0.9=0

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

-r=-0.9

r=-0.9/-1

r=0.9/1

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