24=21-3r

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Solution for 24=21-3r equation: 



24=21-3r

We move all terms to the left:

24-(21-3r)=0

We add all the numbers together, and all the variables

-(-3r+21)+24=0

We get rid of parentheses

3r-21+24=0

We add all the numbers together, and all the variables

3r+3=0

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

3r=-3

r=-3/3

r=-1

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