5r-9=2r-21

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Solution for 5r-9=2r-21 equation: 



5r-9=2r-21

We move all terms to the left:

5r-9-(2r-21)=0

We get rid of parentheses

5r-2r+21-9=0

We add all the numbers together, and all the variables

3r+12=0

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

3r=-12

r=-12/3

r=-4

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