x(x-9)=(x+4)(x-12)

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Solution for x(x-9)=(x+4)(x-12) equation:


Simplifying
x(x + -9) = (x + 4)(x + -12)

Reorder the terms:
x(-9 + x) = (x + 4)(x + -12)
(-9 * x + x * x) = (x + 4)(x + -12)
(-9x + x2) = (x + 4)(x + -12)

Reorder the terms:
-9x + x2 = (4 + x)(x + -12)

Reorder the terms:
-9x + x2 = (4 + x)(-12 + x)

Multiply (4 + x) * (-12 + x)
-9x + x2 = (4(-12 + x) + x(-12 + x))
-9x + x2 = ((-12 * 4 + x * 4) + x(-12 + x))
-9x + x2 = ((-48 + 4x) + x(-12 + x))
-9x + x2 = (-48 + 4x + (-12 * x + x * x))
-9x + x2 = (-48 + 4x + (-12x + x2))

Combine like terms: 4x + -12x = -8x
-9x + x2 = (-48 + -8x + x2)

Add '-1x2' to each side of the equation.
-9x + x2 + -1x2 = -48 + -8x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-9x + 0 = -48 + -8x + x2 + -1x2
-9x = -48 + -8x + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-9x = -48 + -8x + 0
-9x = -48 + -8x

Solving
-9x = -48 + -8x

Solving for variable 'x'.

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

Add '8x' to each side of the equation.
-9x + 8x = -48 + -8x + 8x

Combine like terms: -9x + 8x = -1x
-1x = -48 + -8x + 8x

Combine like terms: -8x + 8x = 0
-1x = -48 + 0
-1x = -48

Divide each side by '-1'.
x = 48

Simplifying
x = 48

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