(4-z)(5z-3)=0

Solution for (4-z)(5z-3)=0 equation:

Simplifying
(4 + -1z)(5z + -3) = 0

Reorder the terms:
(4 + -1z)(-3 + 5z) = 0

Multiply (4 + -1z) * (-3 + 5z)
(4(-3 + 5z) + -1z * (-3 + 5z)) = 0
((-3 * 4 + 5z * 4) + -1z * (-3 + 5z)) = 0
((-12 + 20z) + -1z * (-3 + 5z)) = 0
(-12 + 20z + (-3 * -1z + 5z * -1z)) = 0
(-12 + 20z + (3z + -5z2)) = 0

Combine like terms: 20z + 3z = 23z
(-12 + 23z + -5z2) = 0

Solving
-12 + 23z + -5z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-4 + z)(3 + -5z) = 0

Subproblem 1
Set the factor '(-4 + z)' equal to zero and attempt to solve:

Simplifying
-4 + z = 0

Solving
-4 + z = 0

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

Add '4' to each side of the equation.
-4 + 4 + z = 0 + 4

Combine like terms: -4 + 4 = 0
0 + z = 0 + 4
z = 0 + 4

Combine like terms: 0 + 4 = 4
z = 4

Simplifying
z = 4
Subproblem 2
Set the factor '(3 + -5z)' equal to zero and attempt to solve:

Simplifying
3 + -5z = 0

Solving
3 + -5z = 0

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

Add '-3' to each side of the equation.
3 + -3 + -5z = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -5z = 0 + -3
-5z = 0 + -3

Combine like terms: 0 + -3 = -3
-5z = -3

Divide each side by '-5'.
z = 0.6

Simplifying
z = 0.6
Solution
z = {4, 0.6}