3r+4r=21

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Solution for 3r+4r=21 equation: 


Simplifying
3r + 4r = 21

Combine like terms: 3r + 4r = 7r
7r = 21

Solving
7r = 21

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Divide each side by '7'.
r = 3

Simplifying
r = 3

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