[9+2k]+9=12

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Solution for [9+2k]+9=12 equation:


Simplifying
[9 + 2k] + 9 = 12

Remove brackets around [9 + 2k]
9 + 2k + 9 = 12

Reorder the terms:
9 + 9 + 2k = 12

Combine like terms: 9 + 9 = 18
18 + 2k = 12

Solving
18 + 2k = 12

Solving for variable 'k'.

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

Add '-18' to each side of the equation.
18 + -18 + 2k = 12 + -18

Combine like terms: 18 + -18 = 0
0 + 2k = 12 + -18
2k = 12 + -18

Combine like terms: 12 + -18 = -6
2k = -6

Divide each side by '2'.
k = -3

Simplifying
k = -3

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