y=y(y+4)-y(y-3)-9y

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Solution for y=y(y+4)-y(y-3)-9y equation: 


Simplifying
y = y(y + 4) + -1y(y + -3) + -9y

Reorder the terms:
y = y(4 + y) + -1y(y + -3) + -9y
y = (4 * y + y * y) + -1y(y + -3) + -9y
y = (4y + y2) + -1y(y + -3) + -9y

Reorder the terms:
y = 4y + y2 + -1y(-3 + y) + -9y
y = 4y + y2 + (-3 * -1y + y * -1y) + -9y
y = 4y + y2 + (3y + -1y2) + -9y

Reorder the terms:
y = 4y + 3y + -9y + y2 + -1y2

Combine like terms: 4y + 3y = 7y
y = 7y + -9y + y2 + -1y2

Combine like terms: 7y + -9y = -2y
y = -2y + y2 + -1y2

Combine like terms: y2 + -1y2 = 0
y = -2y + 0
y = -2y

Solving
y = -2y

Solving for variable 'y'.

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

Add '2y' to each side of the equation.
y + 2y = -2y + 2y

Combine like terms: y + 2y = 3y
3y = -2y + 2y

Combine like terms: -2y + 2y = 0
3y = 0

Divide each side by '3'.
y = 0

Simplifying
y = 0

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