21x^2-6=0

Solution for 21x^2-6=0 equation:

Simplifying
21x2 + -6 = 0

Reorder the terms:
-6 + 21x2 = 0

Solving
-6 + 21x2 = 0

Solving for variable 'x'.

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

Add '6' to each side of the equation.
-6 + 6 + 21x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 21x2 = 0 + 6
21x2 = 0 + 6

Combine like terms: 0 + 6 = 6
21x2 = 6

Divide each side by '21'.
x2 = 0.2857142857

Simplifying
x2 = 0.2857142857

Take the square root of each side:
x = {-0.534522484, 0.534522484}