(5y+6)(9+y)=0

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

Simplifying
(5y + 6)(9 + y) = 0

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

Multiply (6 + 5y) * (9 + y)
(6(9 + y) + 5y * (9 + y)) = 0
((9 * 6 + y * 6) + 5y * (9 + y)) = 0
((54 + 6y) + 5y * (9 + y)) = 0
(54 + 6y + (9 * 5y + y * 5y)) = 0
(54 + 6y + (45y + 5y2)) = 0

Combine like terms: 6y + 45y = 51y
(54 + 51y + 5y2) = 0

Solving
54 + 51y + 5y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(9 + y)(6 + 5y) = 0

Subproblem 1
Set the factor '(9 + y)' equal to zero and attempt to solve:

Simplifying
9 + y = 0

Solving
9 + y = 0

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

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

Combine like terms: 9 + -9 = 0
0 + y = 0 + -9
y = 0 + -9

Combine like terms: 0 + -9 = -9
y = -9

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

Simplifying
6 + 5y = 0

Solving
6 + 5y = 0

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

Add '-6' to each side of the equation.
6 + -6 + 5y = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 5y = 0 + -6
5y = 0 + -6

Combine like terms: 0 + -6 = -6
5y = -6

Divide each side by '5'.
y = -1.2

Simplifying
y = -1.2
Solution
y = {-9, -1.2}