(x*y)=(x+8)(y-4)

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Solution for (x*y)=(x+8)(y-4) equation:


Simplifying
(x * y) = (x + 8)(y + -4)

Multiply x * y
(xy) = (x + 8)(y + -4)
xy = (x + 8)(y + -4)

Reorder the terms:
xy = (8 + x)(y + -4)

Reorder the terms:
xy = (8 + x)(-4 + y)

Multiply (8 + x) * (-4 + y)
xy = (8(-4 + y) + x(-4 + y))
xy = ((-4 * 8 + y * 8) + x(-4 + y))
xy = ((-32 + 8y) + x(-4 + y))
xy = (-32 + 8y + (-4 * x + y * x))
xy = (-32 + 8y + (-4x + xy))

Reorder the terms:
xy = (-32 + -4x + xy + 8y)
xy = (-32 + -4x + xy + 8y)

Add '-1xy' to each side of the equation.
xy + -1xy = -32 + -4x + xy + -1xy + 8y

Combine like terms: xy + -1xy = 0
0 = -32 + -4x + xy + -1xy + 8y

Combine like terms: xy + -1xy = 0
0 = -32 + -4x + 0 + 8y
0 = -32 + -4x + 8y

Solving
0 = -32 + -4x + 8y

Solving for variable 'x'.

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

Add '4x' to each side of the equation.
0 + 4x = -32 + -4x + 4x + 8y
Remove the zero:
4x = -32 + -4x + 4x + 8y

Combine like terms: -4x + 4x = 0
4x = -32 + 0 + 8y
4x = -32 + 8y

Divide each side by '4'.
x = -8 + 2y

Simplifying
x = -8 + 2y

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