21x^2y+108xy-108y=0

Solution for 21x^2y+108xy-108y=0 equation:

Simplifying
21x2y + 108xy + -108y = 0

Reorder the terms:
108xy + 21x2y + -108y = 0

Solving
108xy + 21x2y + -108y = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3y'.
3y(36x + 7x2 + -36) = 0

Factor a trinomial.
3y((7x + -6)(x + 6)) = 0

Ignore the factor 3.
Subproblem 1
Set the factor 'y' equal to zero and attempt to solve:

Simplifying
y = 0

Solving
y = 0

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

Add '-1y' to each side of the equation.
y + -1y = 0 + -1y
Remove the zero:
0 = -1y

Simplifying
0 = -1y

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.
Subproblem 2
Set the factor '(7x + -6)' equal to zero and attempt to solve:

Simplifying
7x + -6 = 0

Reorder the terms:
-6 + 7x = 0

Solving
-6 + 7x = 0

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

Add '6' to each side of the equation.
-6 + 6 + 7x = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 7x = 0 + 6
7x = 0 + 6

Combine like terms: 0 + 6 = 6
7x = 6

Divide each side by '7'.
x = 0.8571428571

Simplifying
x = 0.8571428571
Subproblem 3
Set the factor '(x + 6)' equal to zero and attempt to solve:

Simplifying
x + 6 = 0

Reorder the terms:
6 + x = 0

Solving
6 + x = 0

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

Add '-6' to each side of the equation.
6 + -6 + x = 0 + -6

Combine like terms: 6 + -6 = 0
0 + x = 0 + -6
x = 0 + -6

Combine like terms: 0 + -6 = -6
x = -6

Simplifying
x = -6
Solution
x = {0.8571428571, -6}