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

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


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

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

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

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

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

Reorder the terms:
-48 + -8x + x2 = x(-9 + x)
-48 + -8x + x2 = (-9 * x + x * x)
-48 + -8x + x2 = (-9x + x2)

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

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

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

Solving
-48 + -8x = -9x

Solving for variable 'x'.

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

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

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

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

Add '48' to each side of the equation.
-48 + 48 + 1x = 0 + 48

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

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

Divide each side by '1'.
x = 48

Simplifying
x = 48

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