9r-12=2r+16

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Solution for 9r-12=2r+16 equation: 



9r-12=2r+16

We move all terms to the left:

9r-12-(2r+16)=0

We get rid of parentheses

9r-2r-16-12=0

We add all the numbers together, and all the variables

7r-28=0

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

7r=28

r=28/7

r=4

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