21s^2-3s=0

Solution for 21s^2-3s=0 equation:

Simplifying
21s2 + -3s = 0

Reorder the terms:
-3s + 21s2 = 0

Solving
-3s + 21s2 = 0

Solving for variable 's'.

Factor out the Greatest Common Factor (GCF), '3s'.
3s(-1 + 7s) = 0

Ignore the factor 3.
Subproblem 1
Set the factor 's' equal to zero and attempt to solve:

Simplifying
s = 0

Solving
s = 0

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

Simplifying
s = 0
Subproblem 2
Set the factor '(-1 + 7s)' equal to zero and attempt to solve:

Simplifying
-1 + 7s = 0

Solving
-1 + 7s = 0

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

Add '1' to each side of the equation.
-1 + 1 + 7s = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 7s = 0 + 1
7s = 0 + 1

Combine like terms: 0 + 1 = 1
7s = 1

Divide each side by '7'.
s = 0.1428571429

Simplifying
s = 0.1428571429
Solution
s = {0, 0.1428571429}