6-3r=21

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Solution for 6-3r=21 equation: 



6-3r=21

We move all terms to the left:

6-3r-(21)=0

We add all the numbers together, and all the variables

-3r-15=0

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

-3r=15

r=15/-3

r=-5

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