21c^2=3c

Solution for 21c^2=3c equation:

Simplifying
21c2 = 3c

Solving
21c2 = 3c

Solving for variable 'c'.

Reorder the terms:
-3c + 21c2 = 3c + -3c

Combine like terms: 3c + -3c = 0
-3c + 21c2 = 0

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

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

Simplifying
c = 0

Solving
c = 0

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

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

Simplifying
-1 + 7c = 0

Solving
-1 + 7c = 0

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

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

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

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

Divide each side by '7'.
c = 0.1428571429

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