9=r+0.1

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Solution for 9=r+0.1 equation: 



9=r+0.1

We move all terms to the left:

9-(r+0.1)=0

We get rid of parentheses

-r-0.1+9=0

We add all the numbers together, and all the variables

-1r+8.9=0

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

-r=-8.9

r=-8.9/-1

r=8+0.9/1

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