(6+z)(5z-9)=0

Solution for (6+z)(5z-9)=0 equation:

Simplifying
(6 + z)(5z + -9) = 0

Reorder the terms:
(6 + z)(-9 + 5z) = 0

Multiply (6 + z) * (-9 + 5z)
(6(-9 + 5z) + z(-9 + 5z)) = 0
((-9 * 6 + 5z * 6) + z(-9 + 5z)) = 0
((-54 + 30z) + z(-9 + 5z)) = 0
(-54 + 30z + (-9 * z + 5z * z)) = 0
(-54 + 30z + (-9z + 5z2)) = 0

Combine like terms: 30z + -9z = 21z
(-54 + 21z + 5z2) = 0

Solving
-54 + 21z + 5z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-6 + -1z)(9 + -5z) = 0

Subproblem 1
Set the factor '(-6 + -1z)' equal to zero and attempt to solve:

Simplifying
-6 + -1z = 0

Solving
-6 + -1z = 0

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

Add '6' to each side of the equation.
-6 + 6 + -1z = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -1z = 0 + 6
-1z = 0 + 6

Combine like terms: 0 + 6 = 6
-1z = 6

Divide each side by '-1'.
z = -6

Simplifying
z = -6
Subproblem 2
Set the factor '(9 + -5z)' equal to zero and attempt to solve:

Simplifying
9 + -5z = 0

Solving
9 + -5z = 0

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

Add '-9' to each side of the equation.
9 + -9 + -5z = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -5z = 0 + -9
-5z = 0 + -9

Combine like terms: 0 + -9 = -9
-5z = -9

Divide each side by '-5'.
z = 1.8

Simplifying
z = 1.8
Solution
z = {-6, 1.8}