81x^2-5=139

Solution for 81x^2-5=139 equation:

Simplifying
81x2 + -5 = 139

Reorder the terms:
-5 + 81x2 = 139

Solving
-5 + 81x2 = 139

Solving for variable 'x'.

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

Add '5' to each side of the equation.
-5 + 5 + 81x2 = 139 + 5

Combine like terms: -5 + 5 = 0
0 + 81x2 = 139 + 5
81x2 = 139 + 5

Combine like terms: 139 + 5 = 144
81x2 = 144

Divide each side by '81'.
x2 = 1.777777778

Simplifying
x2 = 1.777777778

Take the square root of each side:
x = {-1.333333333, 1.333333333}