9+8r=4r-19

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Solution for 9+8r=4r-19 equation: 



9+8r=4r-19

We move all terms to the left:

9+8r-(4r-19)=0

We get rid of parentheses

8r-4r+19+9=0

We add all the numbers together, and all the variables

4r+28=0

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

4r=-28

r=-28/4

r=-7

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