3.9=r-2.1

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Solution for 3.9=r-2.1 equation: 



3.9=r-2.1

We move all terms to the left:

3.9-(r-2.1)=0

We get rid of parentheses

-r+2.1+3.9=0

We add all the numbers together, and all the variables

-1r+6=0

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

-r=-6

r=-6/-1

r=+6

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