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

Solution for (1+y)*dx-(1+x)dy=0 equation:

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

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

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

Reorder the terms:
1dx + dxy + (-1dxy + -1dy) = 0
1dx + dxy + (-1dxy + -1dy) = 0

Combine like terms: dxy + -1dxy = 0
1dx + 0 + -1dy = 0
1dx + -1dy = 0

Solving
1dx + -1dy = 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), 'd'.
d(x + -1y) = 0

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 '(x + -1y)' equal to zero and attempt to solve:

Simplifying
x + -1y = 0

Solving
x + -1y = 0

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

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

Combine like terms: x + -1x = 0
0 + -1y = 0 + -1x
-1y = 0 + -1x
Remove the zero:
-1y = -1x

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

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

Simplifying
0 = -1x + y

The solution to this equation could not be determined.

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