21=9r-6

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Solution for 21=9r-6 equation:



21=9r-6
We move all terms to the left:
21-(9r-6)=0
We get rid of parentheses
-9r+6+21=0
We add all the numbers together, and all the variables
-9r+27=0
We move all terms containing r to the left, all other terms to the right
-9r=-27
r=-27/-9
r=+3

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