4u+6=3u+21

Solution for 4u+6=3u+21 equation:

Simplifying
4u + 6 = 3u + 21

Reorder the terms:
6 + 4u = 3u + 21

Reorder the terms:
6 + 4u = 21 + 3u

Solving
6 + 4u = 21 + 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.
6 + 4u + -3u = 21 + 3u + -3u

Combine like terms: 4u + -3u = 1u
6 + 1u = 21 + 3u + -3u

Combine like terms: 3u + -3u = 0
6 + 1u = 21 + 0
6 + 1u = 21

Add '-6' to each side of the equation.
6 + -6 + 1u = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 1u = 21 + -6
1u = 21 + -6

Combine like terms: 21 + -6 = 15
1u = 15

Divide each side by '1'.
u = 15

Simplifying
u = 15