19=2r+9

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Solution for 19=2r+9 equation: 



19=2r+9

We move all terms to the left:

19-(2r+9)=0

We get rid of parentheses

-2r-9+19=0

We add all the numbers together, and all the variables

-2r+10=0

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

-2r=-10

r=-10/-2

r=+5

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