(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 = 27
3r = 27

Divide each side by '3'.
r = 9

Simplifying
r = 9

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