21=3-9k

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Solution for 21=3-9k equation:


Simplifying
21 = 3 + -9k

Solving
21 = 3 + -9k

Solving for variable 'k'.

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

Add '9k' to each side of the equation.
21 + 9k = 3 + -9k + 9k

Combine like terms: -9k + 9k = 0
21 + 9k = 3 + 0
21 + 9k = 3

Add '-21' to each side of the equation.
21 + -21 + 9k = 3 + -21

Combine like terms: 21 + -21 = 0
0 + 9k = 3 + -21
9k = 3 + -21

Combine like terms: 3 + -21 = -18
9k = -18

Divide each side by '9'.
k = -2

Simplifying
k = -2

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