3(k+2)+6=21

Solution for 3(k+2)+6=21 equation:

Simplifying
3(k + 2) + 6 = 21

Reorder the terms:
3(2 + k) + 6 = 21
(2 * 3 + k * 3) + 6 = 21
(6 + 3k) + 6 = 21

Reorder the terms:
6 + 6 + 3k = 21

Combine like terms: 6 + 6 = 12
12 + 3k = 21

Solving
12 + 3k = 21

Solving for variable 'k'.

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

Add '-12' to each side of the equation.
12 + -12 + 3k = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 3k = 21 + -12
3k = 21 + -12

Combine like terms: 21 + -12 = 9
3k = 9

Divide each side by '3'.
k = 3

Simplifying
k = 3