21-C=

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Solution for 21-C= equation: 


Simplifying
21 + -1C = 0

Solving
21 + -1C = 0

Solving for variable 'C'.

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

Add '-21' to each side of the equation.
21 + -21 + -1C = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -1C = 0 + -21
-1C = 0 + -21

Combine like terms: 0 + -21 = -21
-1C = -21

Divide each side by '-1'.
C = 21

Simplifying
C = 21

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