21n^2-7n=0

Solution for 21n^2-7n=0 equation:

Simplifying
21n2 + -7n = 0

Reorder the terms:
-7n + 21n2 = 0

Solving
-7n + 21n2 = 0

Solving for variable 'n'.

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

Ignore the factor 7.
Subproblem 1
Set the factor 'n' equal to zero and attempt to solve:

Simplifying
n = 0

Solving
n = 0

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

Simplifying
n = 0
Subproblem 2
Set the factor '(-1 + 3n)' equal to zero and attempt to solve:

Simplifying
-1 + 3n = 0

Solving
-1 + 3n = 0

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

Add '1' to each side of the equation.
-1 + 1 + 3n = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 3n = 0 + 1
3n = 0 + 1

Combine like terms: 0 + 1 = 1
3n = 1

Divide each side by '3'.
n = 0.3333333333

Simplifying
n = 0.3333333333
Solution
n = {0, 0.3333333333}