[2r-6]=21

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Solution for [2r-6]=21 equation: 


Simplifying
[2r + -6] = 21

Reorder the terms:
[-6 + 2r] = 21

Remove brackets around [-6 + 2r]
-6 + 2r = 21

Solving
-6 + 2r = 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 + 2r = 21 + 6

Combine like terms: -6 + 6 = 0
0 + 2r = 21 + 6
2r = 21 + 6

Combine like terms: 21 + 6 = 27
2r = 27

Divide each side by '2'.
r = 13.5

Simplifying
r = 13.5

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