9r+8=21r+11

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Solution for 9r+8=21r+11 equation: 



9r+8=21r+11

We move all terms to the left:

9r+8-(21r+11)=0

We get rid of parentheses

9r-21r-11+8=0

We add all the numbers together, and all the variables

-12r-3=0

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

-12r=3

r=3/-12

r=-1/4

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