(9-y)(3y+7)=0

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Solution for (9-y)(3y+7)=0 equation: 


Simplifying
(9 + -1y)(3y + 7) = 0

Reorder the terms:
(9 + -1y)(7 + 3y) = 0

Multiply (9 + -1y) * (7 + 3y)
(9(7 + 3y) + -1y * (7 + 3y)) = 0
((7 * 9 + 3y * 9) + -1y * (7 + 3y)) = 0
((63 + 27y) + -1y * (7 + 3y)) = 0
(63 + 27y + (7 * -1y + 3y * -1y)) = 0
(63 + 27y + (-7y + -3y2)) = 0

Combine like terms: 27y + -7y = 20y
(63 + 20y + -3y2) = 0

Solving
63 + 20y + -3y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(9 + -1y)(7 + 3y) = 0


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

Simplifying
9 + -1y = 0

Solving
9 + -1y = 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 + -1y = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1y = 0 + -9
-1y = 0 + -9

Combine like terms: 0 + -9 = -9
-1y = -9

Divide each side by '-1'.
y = 9

Simplifying
y = 9

Subproblem 2
Set the factor '(7 + 3y)' equal to zero and attempt to solve:

Simplifying
7 + 3y = 0

Solving
7 + 3y = 0

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

Add '-7' to each side of the equation.
7 + -7 + 3y = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 3y = 0 + -7
3y = 0 + -7

Combine like terms: 0 + -7 = -7
3y = -7

Divide each side by '3'.
y = -2.333333333

Simplifying
y = -2.333333333
Solution
y = {9, -2.333333333}

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