81x^2-36y^2=

Solution for 81x^2-36y^2= equation:

Simplifying
81x2 + -36y2 = 0

Solving
81x2 + -36y2 = 0

Solving for variable 'x'.

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

Add '36y2' to each side of the equation.
81x2 + -36y2 + 36y2 = 0 + 36y2

Combine like terms: -36y2 + 36y2 = 0
81x2 + 0 = 0 + 36y2
81x2 = 0 + 36y2
Remove the zero:
81x2 = 36y2

Divide each side by '81'.
x2 = 0.4444444444y2

Simplifying
x2 = 0.4444444444y2

Take the square root of each side:
x = {-0.666666667y, 0.666666667y}