3c-12=21

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Solution for 3c-12=21 equation:


Simplifying
3c + -12 = 21

Reorder the terms:
-12 + 3c = 21

Solving
-12 + 3c = 21

Solving for variable 'c'.

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

Add '12' to each side of the equation.
-12 + 12 + 3c = 21 + 12

Combine like terms: -12 + 12 = 0
0 + 3c = 21 + 12
3c = 21 + 12

Combine like terms: 21 + 12 = 33
3c = 33

Divide each side by '3'.
c = 11

Simplifying
c = 11

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