2k+k=21

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Solution for 2k+k=21 equation: 


Simplifying
2k + k = 21

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

Solving
3k = 21

Solving for variable 'k'.

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

Divide each side by '3'.
k = 7

Simplifying
k = 7

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