-2(-x^2+1)-2(2x^2-1)=-1

Solution for -2(-x^2+1)-2(2x^2-1)=-1 equation:

Simplifying
-2(-1x2 + 1) + -2(2x2 + -1) = -1

Reorder the terms:
-2(1 + -1x2) + -2(2x2 + -1) = -1
(1 * -2 + -1x2 * -2) + -2(2x2 + -1) = -1
(-2 + 2x2) + -2(2x2 + -1) = -1

Reorder the terms:
-2 + 2x2 + -2(-1 + 2x2) = -1
-2 + 2x2 + (-1 * -2 + 2x2 * -2) = -1
-2 + 2x2 + (2 + -4x2) = -1

Reorder the terms:
-2 + 2 + 2x2 + -4x2 = -1

Combine like terms: -2 + 2 = 0
0 + 2x2 + -4x2 = -1
2x2 + -4x2 = -1

Combine like terms: 2x2 + -4x2 = -2x2
-2x2 = -1

Solving
-2x2 = -1

Solving for variable 'x'.

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

Divide each side by '-2'.
x2 = 0.5

Simplifying
x2 = 0.5

Take the square root of each side:
x = {-0.707106781, 0.707106781}