4r-7r=21

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Solution for 4r-7r=21 equation: 



4r-7r=21

We move all terms to the left:

4r-7r-(21)=0

We add all the numbers together, and all the variables

-3r-21=0

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

-3r=21

r=21/-3

r=-7

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