3c-21=0

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Solution for 3c-21=0 equation: 


Simplifying
3c + -21 = 0

Reorder the terms:
-21 + 3c = 0

Solving
-21 + 3c = 0

Solving for variable 'c'.

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

Add '21' to each side of the equation.
-21 + 21 + 3c = 0 + 21

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

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

Divide each side by '3'.
c = 7

Simplifying
c = 7

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