13.65=r+8.9

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Solution for 13.65=r+8.9 equation: 



13.65=r+8.9

We move all terms to the left:

13.65-(r+8.9)=0

We get rid of parentheses

-r-8.9+13.65=0

We add all the numbers together, and all the variables

-1r+4.75=0

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

-r=-4.75

r=-4.75/-1

r=4+0.75/1

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