x^2-21*x^2+20=0

Solution for x^2-21*x^2+20=0 equation:

Simplifying
x2 + -21x2 + 20 = 0

Reorder the terms:
20 + x2 + -21x2 = 0

Combine like terms: x2 + -21x2 = -20x2
20 + -20x2 = 0

Solving
20 + -20x2 = 0

Solving for variable 'x'.

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

Add '-20' to each side of the equation.
20 + -20 + -20x2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -20x2 = 0 + -20
-20x2 = 0 + -20

Combine like terms: 0 + -20 = -20
-20x2 = -20

Divide each side by '-20'.
x2 = 1

Simplifying
x2 = 1

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