6r-3r=-21

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Solution for 6r-3r=-21 equation: 


Simplifying
6r + -3r = -21

Combine like terms: 6r + -3r = 3r
3r = -21

Solving
3r = -21

Solving for variable 'r'.

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

Divide each side by '3'.
r = -7

Simplifying
r = -7

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