(6+z)(5z-7)=0

Solution for (6+z)(5z-7)=0 equation:

Simplifying
(6 + z)(5z + -7) = 0

Reorder the terms:
(6 + z)(-7 + 5z) = 0

Multiply (6 + z) * (-7 + 5z)
(6(-7 + 5z) + z(-7 + 5z)) = 0
((-7 * 6 + 5z * 6) + z(-7 + 5z)) = 0
((-42 + 30z) + z(-7 + 5z)) = 0
(-42 + 30z + (-7 * z + 5z * z)) = 0
(-42 + 30z + (-7z + 5z2)) = 0

Combine like terms: 30z + -7z = 23z
(-42 + 23z + 5z2) = 0

Solving
-42 + 23z + 5z2 = 0

Solving for variable 'z'.

Factor a trinomial.
(-6 + -1z)(7 + -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 '(7 + -5z)' equal to zero and attempt to solve:

Simplifying
7 + -5z = 0

Solving
7 + -5z = 0

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

Add '-7' to each side of the equation.
7 + -7 + -5z = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -5z = 0 + -7
-5z = 0 + -7

Combine like terms: 0 + -7 = -7
-5z = -7

Divide each side by '-5'.
z = 1.4

Simplifying
z = 1.4
Solution
z = {-6, 1.4}