21-c=2c+9

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Solution for 21-c=2c+9 equation:


Simplifying
21 + -1c = 2c + 9

Reorder the terms:
21 + -1c = 9 + 2c

Solving
21 + -1c = 9 + 2c

Solving for variable 'c'.

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

Add '-2c' to each side of the equation.
21 + -1c + -2c = 9 + 2c + -2c

Combine like terms: -1c + -2c = -3c
21 + -3c = 9 + 2c + -2c

Combine like terms: 2c + -2c = 0
21 + -3c = 9 + 0
21 + -3c = 9

Add '-21' to each side of the equation.
21 + -21 + -3c = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -3c = 9 + -21
-3c = 9 + -21

Combine like terms: 9 + -21 = -12
-3c = -12

Divide each side by '-3'.
c = 4

Simplifying
c = 4

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