(1+2u)(-3)=

Solution for (1+2u)(-3)= equation:

Simplifying
(1 + 2u)(-3) = 0

Reorder the terms for easier multiplication:
-3(1 + 2u) = 0
(1 * -3 + 2u * -3) = 0
(-3 + -6u) = 0

Solving
-3 + -6u = 0

Solving for variable 'u'.

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

Add '3' to each side of the equation.
-3 + 3 + -6u = 0 + 3

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

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

Divide each side by '-6'.
u = -0.5

Simplifying
u = -0.5