42=uk

Solution for 42=uk equation:

Simplifying
42 = uk

Solving
42 = ku

Solving for variable 'k'.

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

Add '-1ku' to each side of the equation.
42 + -1ku = ku + -1ku

Combine like terms: ku + -1ku = 0
42 + -1ku = 0

Add '-42' to each side of the equation.
42 + -42 + -1ku = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -1ku = 0 + -42
-1ku = 0 + -42

Combine like terms: 0 + -42 = -42
-1ku = -42

Divide each side by '-1u'.
k = 42u-1

Simplifying
k = 42u-1