15=-21+9k

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Solution for 15=-21+9k equation:


Simplifying
15 = -21 + 9k

Solving
15 = -21 + 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.
15 + -9k = -21 + 9k + -9k

Combine like terms: 9k + -9k = 0
15 + -9k = -21 + 0
15 + -9k = -21

Add '-15' to each side of the equation.
15 + -15 + -9k = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -9k = -21 + -15
-9k = -21 + -15

Combine like terms: -21 + -15 = -36
-9k = -36

Divide each side by '-9'.
k = 4

Simplifying
k = 4

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