21=3c-6

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Solution for 21=3c-6 equation:


Simplifying
21 = 3c + -6

Reorder the terms:
21 = -6 + 3c

Solving
21 = -6 + 3c

Solving for variable 'c'.

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

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

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

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

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

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

Divide each side by '-3'.
c = 9

Simplifying
c = 9

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