(121x^2-81y^2)=

Solution for (121x^2-81y^2)= equation:

Simplifying
(121x2 + -81y2) = 0

Remove parenthesis around (121x2 + -81y2)
121x2 + -81y2 = 0

Solving
121x2 + -81y2 = 0

Solving for variable 'x'.

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

Add '81y2' to each side of the equation.
121x2 + -81y2 + 81y2 = 0 + 81y2

Combine like terms: -81y2 + 81y2 = 0
121x2 + 0 = 0 + 81y2
121x2 = 0 + 81y2
Remove the zero:
121x2 = 81y2

Divide each side by '121'.
x2 = 0.6694214876y2

Simplifying
x2 = 0.6694214876y2

Take the square root of each side:
x = {-0.818181818y, 0.818181818y}