21=dc+e

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Solution for 21=dc+e equation:


Simplifying
21 = dc + 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 + -1d-1e

Simplifying
c = 21d-1 + -1d-1e

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