(1[2-u]1)(1[3u+1]1)=0

Solution for (1[2-u]1)(1[3u+1]1)=0 equation:

Simplifying
(1[2 + -1u] * 1)(1[3u + 1] * 1) = 0

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

Multiply 1 * 1
(1[2 + -1u])(1[3u + 1] * 1) = 0
([2 * 1 + -1u * 1])(1[3u + 1] * 1) = 0
([2 + -1u])(1[3u + 1] * 1) = 0

Reorder the terms:
(2 + -1u)(1[1 + 3u] * 1) = 0

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

Multiply 1 * 1
(2 + -1u)(1[1 + 3u]) = 0
(2 + -1u)([1 * 1 + 3u * 1]) = 0
(2 + -1u)([1 + 3u]) = 0

Multiply (2 + -1u) * (1 + 3u)
(2(1 + 3u) + -1u * (1 + 3u)) = 0
((1 * 2 + 3u * 2) + -1u * (1 + 3u)) = 0
((2 + 6u) + -1u * (1 + 3u)) = 0
(2 + 6u + (1 * -1u + 3u * -1u)) = 0
(2 + 6u + (-1u + -3u2)) = 0

Combine like terms: 6u + -1u = 5u
(2 + 5u + -3u2) = 0

Solving
2 + 5u + -3u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(2 + -1u)(1 + 3u) = 0

Subproblem 1
Set the factor '(2 + -1u)' equal to zero and attempt to solve:

Simplifying
2 + -1u = 0

Solving
2 + -1u = 0

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

Add '-2' to each side of the equation.
2 + -2 + -1u = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -1u = 0 + -2
-1u = 0 + -2

Combine like terms: 0 + -2 = -2
-1u = -2

Divide each side by '-1'.
u = 2

Simplifying
u = 2
Subproblem 2
Set the factor '(1 + 3u)' equal to zero and attempt to solve:

Simplifying
1 + 3u = 0

Solving
1 + 3u = 0

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

Add '-1' to each side of the equation.
1 + -1 + 3u = 0 + -1

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

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

Divide each side by '3'.
u = -0.3333333333

Simplifying
u = -0.3333333333
Solution
u = {2, -0.3333333333}