21r-9=54

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Solution for 21r-9=54 equation: 



21r-9=54

We move all terms to the left:

21r-9-(54)=0

We add all the numbers together, and all the variables

21r-63=0

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

21r=63

r=63/21

r=3

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