42=2u+4u

Solution for 42=2u+4u equation:

Simplifying
42 = 2u + 4u

Combine like terms: 2u + 4u = 6u
42 = 6u

Solving
42 = 6u

Solving for variable 'u'.

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

Add '-6u' to each side of the equation.
42 + -6u = 6u + -6u

Combine like terms: 6u + -6u = 0
42 + -6u = 0

Add '-42' to each side of the equation.
42 + -42 + -6u = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -6u = 0 + -42
-6u = 0 + -42

Combine like terms: 0 + -42 = -42
-6u = -42

Divide each side by '-6'.
u = 7

Simplifying
u = 7