3r+6=-21

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Solution for 3r+6=-21 equation: 


Simplifying
3r + 6 = -21

Reorder the terms:
6 + 3r = -21

Solving
6 + 3r = -21

Solving for variable 'r'.

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

Add '-6' to each side of the equation.
6 + -6 + 3r = -21 + -6

Combine like terms: 6 + -6 = 0
0 + 3r = -21 + -6
3r = -21 + -6

Combine like terms: -21 + -6 = -27
3r = -27

Divide each side by '3'.
r = -9

Simplifying
r = -9

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