42=2u

Solution for 42=2u equation:

Simplifying
42 = 2u

Solving
42 = 2u

Solving for variable 'u'.

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

Add '-2u' to each side of the equation.
42 + -2u = 2u + -2u

Combine like terms: 2u + -2u = 0
42 + -2u = 0

Add '-42' to each side of the equation.
42 + -42 + -2u = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -2u = 0 + -42
-2u = 0 + -42

Combine like terms: 0 + -42 = -42
-2u = -42

Divide each side by '-2'.
u = 21

Simplifying
u = 21