3(k+8)-k=21

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Solution for 3(k+8)-k=21 equation: 


Simplifying
3(k + 8) + -1k = 21

Reorder the terms:
3(8 + k) + -1k = 21
(8 * 3 + k * 3) + -1k = 21
(24 + 3k) + -1k = 21

Combine like terms: 3k + -1k = 2k
24 + 2k = 21

Solving
24 + 2k = 21

Solving for variable 'k'.

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

Add '-24' to each side of the equation.
24 + -24 + 2k = 21 + -24

Combine like terms: 24 + -24 = 0
0 + 2k = 21 + -24
2k = 21 + -24

Combine like terms: 21 + -24 = -3
2k = -3

Divide each side by '2'.
k = -1.5

Simplifying
k = -1.5

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