172=-9r-8

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Solution for 172=-9r-8 equation: 



172=-9r-8

We move all terms to the left:

172-(-9r-8)=0

We get rid of parentheses

9r+8+172=0

We add all the numbers together, and all the variables

9r+180=0

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

9r=-180

r=-180/9

r=-20

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