42-4u=3u

Solution for 42-4u=3u equation:

Simplifying
42 + -4u = 3u

Solving
42 + -4u = 3u

Solving for variable 'u'.

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

Add '-3u' to each side of the equation.
42 + -4u + -3u = 3u + -3u

Combine like terms: -4u + -3u = -7u
42 + -7u = 3u + -3u

Combine like terms: 3u + -3u = 0
42 + -7u = 0

Add '-42' to each side of the equation.
42 + -42 + -7u = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -7u = 0 + -42
-7u = 0 + -42

Combine like terms: 0 + -42 = -42
-7u = -42

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

Simplifying
u = 6