3=-12u

Solution for 3=-12u equation:

Simplifying
3 = -12u

Solving
3 = -12u

Solving for variable 'u'.

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

Add '12u' to each side of the equation.
3 + 12u = -12u + 12u

Combine like terms: -12u + 12u = 0
3 + 12u = 0

Add '-3' to each side of the equation.
3 + -3 + 12u = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 12u = 0 + -3
12u = 0 + -3

Combine like terms: 0 + -3 = -3
12u = -3

Divide each side by '12'.
u = -0.25

Simplifying
u = -0.25