(y-4)(y+7)=y(y-3)

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Solution for (y-4)(y+7)=y(y-3) equation:


Simplifying
(y + -4)(y + 7) = y(y + -3)

Reorder the terms:
(-4 + y)(y + 7) = y(y + -3)

Reorder the terms:
(-4 + y)(7 + y) = y(y + -3)

Multiply (-4 + y) * (7 + y)
(-4(7 + y) + y(7 + y)) = y(y + -3)
((7 * -4 + y * -4) + y(7 + y)) = y(y + -3)
((-28 + -4y) + y(7 + y)) = y(y + -3)
(-28 + -4y + (7 * y + y * y)) = y(y + -3)
(-28 + -4y + (7y + y2)) = y(y + -3)

Combine like terms: -4y + 7y = 3y
(-28 + 3y + y2) = y(y + -3)

Reorder the terms:
-28 + 3y + y2 = y(-3 + y)
-28 + 3y + y2 = (-3 * y + y * y)
-28 + 3y + y2 = (-3y + y2)

Add '-1y2' to each side of the equation.
-28 + 3y + y2 + -1y2 = -3y + y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-28 + 3y + 0 = -3y + y2 + -1y2
-28 + 3y = -3y + y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-28 + 3y = -3y + 0
-28 + 3y = -3y

Solving
-28 + 3y = -3y

Solving for variable 'y'.

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

Add '3y' to each side of the equation.
-28 + 3y + 3y = -3y + 3y

Combine like terms: 3y + 3y = 6y
-28 + 6y = -3y + 3y

Combine like terms: -3y + 3y = 0
-28 + 6y = 0

Add '28' to each side of the equation.
-28 + 28 + 6y = 0 + 28

Combine like terms: -28 + 28 = 0
0 + 6y = 0 + 28
6y = 0 + 28

Combine like terms: 0 + 28 = 28
6y = 28

Divide each side by '6'.
y = 4.666666667

Simplifying
y = 4.666666667

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