21=0.7*k

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Solution for 21=0.7*k equation:


Simplifying
21 = 0.7k

Solving
21 = 0.7k

Solving for variable 'k'.

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

Add '-0.7k' to each side of the equation.
21 + -0.7k = 0.7k + -0.7k

Combine like terms: 0.7k + -0.7k = 0.0
21 + -0.7k = 0.0

Add '-21' to each side of the equation.
21 + -21 + -0.7k = 0.0 + -21

Combine like terms: 21 + -21 = 0
0 + -0.7k = 0.0 + -21
-0.7k = 0.0 + -21

Combine like terms: 0.0 + -21 = -21
-0.7k = -21

Divide each side by '-0.7'.
k = 30

Simplifying
k = 30

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