21=3(c-9)

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Solution for 21=3(c-9) equation: 


Simplifying
21 = 3(c + -9)

Reorder the terms:
21 = 3(-9 + c)
21 = (-9 * 3 + c * 3)
21 = (-27 + 3c)

Solving
21 = -27 + 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 = -27 + 3c + -3c

Combine like terms: 3c + -3c = 0
21 + -3c = -27 + 0
21 + -3c = -27

Add '-21' to each side of the equation.
21 + -21 + -3c = -27 + -21

Combine like terms: 21 + -21 = 0
0 + -3c = -27 + -21
-3c = -27 + -21

Combine like terms: -27 + -21 = -48
-3c = -48

Divide each side by '-3'.
c = 16

Simplifying
c = 16

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