-21=9+10k

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Solution for -21=9+10k equation:


Simplifying
-21 = 9 + 10k

Solving
-21 = 9 + 10k

Solving for variable 'k'.

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

Add '-10k' to each side of the equation.
-21 + -10k = 9 + 10k + -10k

Combine like terms: 10k + -10k = 0
-21 + -10k = 9 + 0
-21 + -10k = 9

Add '21' to each side of the equation.
-21 + 21 + -10k = 9 + 21

Combine like terms: -21 + 21 = 0
0 + -10k = 9 + 21
-10k = 9 + 21

Combine like terms: 9 + 21 = 30
-10k = 30

Divide each side by '-10'.
k = -3

Simplifying
k = -3

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