-15x^2+90+10-85=0

Solution for -15x^2+90+10-85=0 equation:

Simplifying
-15x2 + 90 + 10 + -85 = 0

Reorder the terms:
90 + 10 + -85 + -15x2 = 0

Combine like terms: 90 + 10 = 100
100 + -85 + -15x2 = 0

Combine like terms: 100 + -85 = 15
15 + -15x2 = 0

Solving
15 + -15x2 = 0

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + -15x2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -15x2 = 0 + -15
-15x2 = 0 + -15

Combine like terms: 0 + -15 = -15
-15x2 = -15

Divide each side by '-15'.
x2 = 1

Simplifying
x2 = 1

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