9k-21=21

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Solution for 9k-21=21 equation: 


Simplifying
9k + -21 = 21

Reorder the terms:
-21 + 9k = 21

Solving
-21 + 9k = 21

Solving for variable 'k'.

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

Add '21' to each side of the equation.
-21 + 21 + 9k = 21 + 21

Combine like terms: -21 + 21 = 0
0 + 9k = 21 + 21
9k = 21 + 21

Combine like terms: 21 + 21 = 42
9k = 42

Divide each side by '9'.
k = 4.666666667

Simplifying
k = 4.666666667

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