x^2+2x^2+20-80=180

Solution for x^2+2x^2+20-80=180 equation:

Simplifying
x2 + 2x2 + 20 + -80 = 180

Reorder the terms:
20 + -80 + x2 + 2x2 = 180

Combine like terms: 20 + -80 = -60
-60 + x2 + 2x2 = 180

Combine like terms: x2 + 2x2 = 3x2
-60 + 3x2 = 180

Solving
-60 + 3x2 = 180

Solving for variable 'x'.

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

Add '60' to each side of the equation.
-60 + 60 + 3x2 = 180 + 60

Combine like terms: -60 + 60 = 0
0 + 3x2 = 180 + 60
3x2 = 180 + 60

Combine like terms: 180 + 60 = 240
3x2 = 240

Divide each side by '3'.
x2 = 80

Simplifying
x2 = 80

Take the square root of each side:
x = {-8.94427191, 8.94427191}