-9x^2-15+20=0

Solution for -9x^2-15+20=0 equation:

Simplifying
-9x2 + -15 + 20 = 0

Reorder the terms:
-15 + 20 + -9x2 = 0

Combine like terms: -15 + 20 = 5
5 + -9x2 = 0

Solving
5 + -9x2 = 0

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 + -9x2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -9x2 = 0 + -5
-9x2 = 0 + -5

Combine like terms: 0 + -5 = -5
-9x2 = -5

Divide each side by '-9'.
x2 = 0.5555555556

Simplifying
x2 = 0.5555555556

Take the square root of each side:
x = {-0.745355993, 0.745355993}