(-30x^2)-60x^2+90=0

Solution for (-30x^2)-60x^2+90=0 equation:

Simplifying
(-30x2) + -60x2 + 90 = 0

Reorder the terms:
90 + (-30x2) + -60x2 = 0

Combine like terms: (-30x2) + -60x2 = -90x2
90 + -90x2 = 0

Solving
90 + -90x2 = 0

Solving for variable 'x'.

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

Add '-90' to each side of the equation.
90 + -90 + -90x2 = 0 + -90

Combine like terms: 90 + -90 = 0
0 + -90x2 = 0 + -90
-90x2 = 0 + -90

Combine like terms: 0 + -90 = -90
-90x2 = -90

Divide each side by '-90'.
x2 = 1

Simplifying
x2 = 1

Take the square root of each side:
x = {-1, 1}