(x-a)(y-a)=0.8xy

Solution for (x-a)(y-a)=0.8xy equation:

Simplifying
(x + -1a)(y + -1a) = 0.8xy

Reorder the terms:
(-1a + x)(y + -1a) = 0.8xy

Reorder the terms:
(-1a + x)(-1a + y) = 0.8xy

Multiply (-1a + x) * (-1a + y)
(-1a * (-1a + y) + x(-1a + y)) = 0.8xy
((-1a * -1a + y * -1a) + x(-1a + y)) = 0.8xy

Reorder the terms:
((-1ay + 1a2) + x(-1a + y)) = 0.8xy
((-1ay + 1a2) + x(-1a + y)) = 0.8xy
(-1ay + 1a2 + (-1a * x + y * x)) = 0.8xy
(-1ay + 1a2 + (-1ax + xy)) = 0.8xy

Reorder the terms:
(-1ax + -1ay + 1a2 + xy) = 0.8xy
(-1ax + -1ay + 1a2 + xy) = 0.8xy

Solving
-1ax + -1ay + 1a2 + xy = 0.8xy

Solving for variable 'a'.

Combine like terms: xy + -0.8xy = 0.2xy
-1ax + -1ay + 1a2 + 0.2xy = 0.8xy + -0.8xy

Combine like terms: 0.8xy + -0.8xy = 0.0
-1ax + -1ay + 1a2 + 0.2xy = 0.0

The solution to this equation could not be determined.