21=CD+e

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Solution for 21=CD+e equation:


Simplifying
21 = CD + e

Solving
21 = CD + e

Solving for variable 'C'.

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

Add '-1CD' to each side of the equation.
21 + -1CD = CD + -1CD + e

Combine like terms: CD + -1CD = 0
21 + -1CD = 0 + e
21 + -1CD = e

Add '-21' to each side of the equation.
21 + -21 + -1CD = -21 + e

Combine like terms: 21 + -21 = 0
0 + -1CD = -21 + e
-1CD = -21 + e

Divide each side by '-1D'.
C = 21D-1 + -1eD-1

Simplifying
C = 21D-1 + -1eD-1

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