21=k-8k

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Solution for 21=k-8k equation:


Simplifying
21 = k + -8k

Combine like terms: k + -8k = -7k
21 = -7k

Solving
21 = -7k

Solving for variable 'k'.

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

Add '7k' to each side of the equation.
21 + 7k = -7k + 7k

Combine like terms: -7k + 7k = 0
21 + 7k = 0

Add '-21' to each side of the equation.
21 + -21 + 7k = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 7k = 0 + -21
7k = 0 + -21

Combine like terms: 0 + -21 = -21
7k = -21

Divide each side by '7'.
k = -3

Simplifying
k = -3

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