x(3x-3)+x(4x-4)=(7x+9)(x-4)

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Solution for x(3x-3)+x(4x-4)=(7x+9)(x-4) equation:


Simplifying
x(3x + -3) + x(4x + -4) = (7x + 9)(x + -4)

Reorder the terms:
x(-3 + 3x) + x(4x + -4) = (7x + 9)(x + -4)
(-3 * x + 3x * x) + x(4x + -4) = (7x + 9)(x + -4)
(-3x + 3x2) + x(4x + -4) = (7x + 9)(x + -4)

Reorder the terms:
-3x + 3x2 + x(-4 + 4x) = (7x + 9)(x + -4)
-3x + 3x2 + (-4 * x + 4x * x) = (7x + 9)(x + -4)
-3x + 3x2 + (-4x + 4x2) = (7x + 9)(x + -4)

Reorder the terms:
-3x + -4x + 3x2 + 4x2 = (7x + 9)(x + -4)

Combine like terms: -3x + -4x = -7x
-7x + 3x2 + 4x2 = (7x + 9)(x + -4)

Combine like terms: 3x2 + 4x2 = 7x2
-7x + 7x2 = (7x + 9)(x + -4)

Reorder the terms:
-7x + 7x2 = (9 + 7x)(x + -4)

Reorder the terms:
-7x + 7x2 = (9 + 7x)(-4 + x)

Multiply (9 + 7x) * (-4 + x)
-7x + 7x2 = (9(-4 + x) + 7x * (-4 + x))
-7x + 7x2 = ((-4 * 9 + x * 9) + 7x * (-4 + x))
-7x + 7x2 = ((-36 + 9x) + 7x * (-4 + x))
-7x + 7x2 = (-36 + 9x + (-4 * 7x + x * 7x))
-7x + 7x2 = (-36 + 9x + (-28x + 7x2))

Combine like terms: 9x + -28x = -19x
-7x + 7x2 = (-36 + -19x + 7x2)

Add '-7x2' to each side of the equation.
-7x + 7x2 + -7x2 = -36 + -19x + 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
-7x + 0 = -36 + -19x + 7x2 + -7x2
-7x = -36 + -19x + 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
-7x = -36 + -19x + 0
-7x = -36 + -19x

Solving
-7x = -36 + -19x

Solving for variable 'x'.

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

Add '19x' to each side of the equation.
-7x + 19x = -36 + -19x + 19x

Combine like terms: -7x + 19x = 12x
12x = -36 + -19x + 19x

Combine like terms: -19x + 19x = 0
12x = -36 + 0
12x = -36

Divide each side by '12'.
x = -3

Simplifying
x = -3

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