(1[5z+1]1)(1[5-z]1)=0

Solution for (1[5z+1]1)(1[5-z]1)=0 equation:

Simplifying
(1[5z + 1] * 1)(1[5 + -1z] * 1) = 0

Reorder the terms:
(1[1 + 5z] * 1)(1[5 + -1z] * 1) = 0

Reorder the terms for easier multiplication:
(1 * 1[1 + 5z])(1[5 + -1z] * 1) = 0

Multiply 1 * 1
(1[1 + 5z])(1[5 + -1z] * 1) = 0
([1 * 1 + 5z * 1])(1[5 + -1z] * 1) = 0
([1 + 5z])(1[5 + -1z] * 1) = 0

Reorder the terms for easier multiplication:
(1 + 5z)(1 * 1[5 + -1z]) = 0

Multiply 1 * 1
(1 + 5z)(1[5 + -1z]) = 0
(1 + 5z)([5 * 1 + -1z * 1]) = 0
(1 + 5z)([5 + -1z]) = 0

Multiply (1 + 5z) * (5 + -1z)
(1(5 + -1z) + 5z * (5 + -1z)) = 0
((5 * 1 + -1z * 1) + 5z * (5 + -1z)) = 0
((5 + -1z) + 5z * (5 + -1z)) = 0
(5 + -1z + (5 * 5z + -1z * 5z)) = 0
(5 + -1z + (25z + -5z2)) = 0

Combine like terms: -1z + 25z = 24z
(5 + 24z + -5z2) = 0

Solving
5 + 24z + -5z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(5 + -1z)(1 + 5z) = 0

Subproblem 1
Set the factor '(5 + -1z)' equal to zero and attempt to solve:

Simplifying
5 + -1z = 0

Solving
5 + -1z = 0

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

Add '-5' to each side of the equation.
5 + -5 + -1z = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -1z = 0 + -5
-1z = 0 + -5

Combine like terms: 0 + -5 = -5
-1z = -5

Divide each side by '-1'.
z = 5

Simplifying
z = 5
Subproblem 2
Set the factor '(1 + 5z)' equal to zero and attempt to solve:

Simplifying
1 + 5z = 0

Solving
1 + 5z = 0

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

Add '-1' to each side of the equation.
1 + -1 + 5z = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 5z = 0 + -1
5z = 0 + -1

Combine like terms: 0 + -1 = -1
5z = -1

Divide each side by '5'.
z = -0.2

Simplifying
z = -0.2
Solution
z = {5, -0.2}