3c-6=21

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Solution for 3c-6=21 equation: 


Simplifying
3c + -6 = 21

Reorder the terms:
-6 + 3c = 21

Solving
-6 + 3c = 21

Solving for variable 'c'.

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

Add '6' to each side of the equation.
-6 + 6 + 3c = 21 + 6

Combine like terms: -6 + 6 = 0
0 + 3c = 21 + 6
3c = 21 + 6

Combine like terms: 21 + 6 = 27
3c = 27

Divide each side by '3'.
c = 9

Simplifying
c = 9

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