123=3(5u-4)

Solution for 123=3(5u-4) equation:

Simplifying
123 = 3(5u + -4)

Reorder the terms:
123 = 3(-4 + 5u)
123 = (-4 * 3 + 5u * 3)
123 = (-12 + 15u)

Solving
123 = -12 + 15u

Solving for variable 'u'.

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

Add '-15u' to each side of the equation.
123 + -15u = -12 + 15u + -15u

Combine like terms: 15u + -15u = 0
123 + -15u = -12 + 0
123 + -15u = -12

Add '-123' to each side of the equation.
123 + -123 + -15u = -12 + -123

Combine like terms: 123 + -123 = 0
0 + -15u = -12 + -123
-15u = -12 + -123

Combine like terms: -12 + -123 = -135
-15u = -135

Divide each side by '-15'.
u = 9

Simplifying
u = 9