-21=9-k

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Solution for -21=9-k equation:


Simplifying
-21 = 9 + -1k

Solving
-21 = 9 + -1k

Solving for variable 'k'.

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

Add 'k' to each side of the equation.
-21 + k = 9 + -1k + k

Combine like terms: -1k + k = 0
-21 + k = 9 + 0
-21 + k = 9

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

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

Combine like terms: 9 + 21 = 30
k = 30

Simplifying
k = 30

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