(3-z)(2z+1)=0

Solution for (3-z)(2z+1)=0 equation:

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

Reorder the terms:
(3 + -1z)(1 + 2z) = 0

Multiply (3 + -1z) * (1 + 2z)
(3(1 + 2z) + -1z * (1 + 2z)) = 0
((1 * 3 + 2z * 3) + -1z * (1 + 2z)) = 0
((3 + 6z) + -1z * (1 + 2z)) = 0
(3 + 6z + (1 * -1z + 2z * -1z)) = 0
(3 + 6z + (-1z + -2z2)) = 0

Combine like terms: 6z + -1z = 5z
(3 + 5z + -2z2) = 0

Solving
3 + 5z + -2z2 = 0

Solving for variable 'z'.

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

Subproblem 1
Set the factor '(3 + -1z)' equal to zero and attempt to solve:

Simplifying
3 + -1z = 0

Solving
3 + -1z = 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 + -1z = 0 + -3

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

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

Divide each side by '-1'.
z = 3

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

Simplifying
1 + 2z = 0

Solving
1 + 2z = 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 + 2z = 0 + -1

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

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

Divide each side by '2'.
z = -0.5

Simplifying
z = -0.5
Solution
z = {3, -0.5}