(3r+6)=21

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Solution for (3r+6)=21 equation: 


Simplifying
(3r + 6) = 21

Reorder the terms:
(6 + 3r) = 21

Remove parenthesis around (6 + 3r)
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 = 15
3r = 15

Divide each side by '3'.
r = 5

Simplifying
r = 5

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