90=(x+y)+xy

Solution for 90=(x+y)+xy equation:

Simplifying
90 = (x + y) + xy

Remove parenthesis around (x + y)
90 = x + y + xy

Reorder the terms:
90 = x + xy + y

Solving
90 = x + xy + y

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
90 + -1x = x + xy + -1x + y

Reorder the terms:
90 + -1x = x + -1x + xy + y

Combine like terms: x + -1x = 0
90 + -1x = 0 + xy + y
90 + -1x = xy + y

Add '-1xy' to each side of the equation.
90 + -1x + -1xy = xy + -1xy + y

Combine like terms: xy + -1xy = 0
90 + -1x + -1xy = 0 + y
90 + -1x + -1xy = y

Add '-90' to each side of the equation.
90 + -1x + -90 + -1xy = -90 + y

Reorder the terms:
90 + -90 + -1x + -1xy = -90 + y

Combine like terms: 90 + -90 = 0
0 + -1x + -1xy = -90 + y
-1x + -1xy = -90 + y

Reorder the terms:
90 + -1x + -1xy + -1y = -90 + y + 90 + -1y

Reorder the terms:
90 + -1x + -1xy + -1y = -90 + 90 + y + -1y

Combine like terms: -90 + 90 = 0
90 + -1x + -1xy + -1y = 0 + y + -1y
90 + -1x + -1xy + -1y = y + -1y

Combine like terms: y + -1y = 0
90 + -1x + -1xy + -1y = 0

The solution to this equation could not be determined.