4k-9=-21

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Solution for 4k-9=-21 equation: 


Simplifying
4k + -9 = -21

Reorder the terms:
-9 + 4k = -21

Solving
-9 + 4k = -21

Solving for variable 'k'.

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

Add '9' to each side of the equation.
-9 + 9 + 4k = -21 + 9

Combine like terms: -9 + 9 = 0
0 + 4k = -21 + 9
4k = -21 + 9

Combine like terms: -21 + 9 = -12
4k = -12

Divide each side by '4'.
k = -3

Simplifying
k = -3

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