7k-3n=21

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Solution for 7k-3n=21 equation: 


Simplifying
7k + -3n = 21

Solving
7k + -3n = 21

Solving for variable 'k'.

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

Add '3n' to each side of the equation.
7k + -3n + 3n = 21 + 3n

Combine like terms: -3n + 3n = 0
7k + 0 = 21 + 3n
7k = 21 + 3n

Divide each side by '7'.
k = 3 + 0.4285714286n

Simplifying
k = 3 + 0.4285714286n

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