(x-y)dy-(x+y)dx=0

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Solution for (x-y)dy-(x+y)dx=0 equation: 


Simplifying
(x + -1y) * dy + -1(x + y) * dx = 0

Reorder the terms for easier multiplication:
dy(x + -1y) + -1(x + y) * dx = 0
(x * dy + -1y * dy) + -1(x + y) * dx = 0
(dxy + -1dy2) + -1(x + y) * dx = 0

Reorder the terms for easier multiplication:
dxy + -1dy2 + -1dx(x + y) = 0
dxy + -1dy2 + (x * -1dx + y * -1dx) = 0

Reorder the terms:
dxy + -1dy2 + (-1dxy + -1dx2) = 0
dxy + -1dy2 + (-1dxy + -1dx2) = 0

Reorder the terms:
dxy + -1dxy + -1dx2 + -1dy2 = 0

Combine like terms: dxy + -1dxy = 0
0 + -1dx2 + -1dy2 = 0
-1dx2 + -1dy2 = 0

Solving
-1dx2 + -1dy2 = 0

Solving for variable 'd'.

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

Factor out the Greatest Common Factor (GCF), '-1d'.
-1d(x2 + y2) = 0

Ignore the factor -1.

Subproblem 1
Set the factor 'd' equal to zero and attempt to solve:

Simplifying
d = 0

Solving
d = 0

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

Simplifying
d = 0

Subproblem 2
Set the factor '(x2 + y2)' equal to zero and attempt to solve:

Simplifying
x2 + y2 = 0

Solving
x2 + y2 = 0

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

Add '-1x2' to each side of the equation.
x2 + -1x2 + y2 = 0 + -1x2

Combine like terms: x2 + -1x2 = 0
0 + y2 = 0 + -1x2
y2 = 0 + -1x2
Remove the zero:
y2 = -1x2

Add '-1y2' to each side of the equation.
y2 + -1y2 = -1x2 + -1y2

Combine like terms: y2 + -1y2 = 0
0 = -1x2 + -1y2

Simplifying
0 = -1x2 + -1y2

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.
Solution
d = {0}

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