-5k-6=-21

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Solution for -5k-6=-21 equation: 


Simplifying
-5k + -6 = -21

Reorder the terms:
-6 + -5k = -21

Solving
-6 + -5k = -21

Solving for variable 'k'.

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

Add '6' to each side of the equation.
-6 + 6 + -5k = -21 + 6

Combine like terms: -6 + 6 = 0
0 + -5k = -21 + 6
-5k = -21 + 6

Combine like terms: -21 + 6 = -15
-5k = -15

Divide each side by '-5'.
k = 3

Simplifying
k = 3

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