21-d=5

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Solution for 21-d=5 equation: 


Simplifying
21 + -1d = 5

Solving
21 + -1d = 5

Solving for variable 'd'.

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

Add '-21' to each side of the equation.
21 + -21 + -1d = 5 + -21

Combine like terms: 21 + -21 = 0
0 + -1d = 5 + -21
-1d = 5 + -21

Combine like terms: 5 + -21 = -16
-1d = -16

Divide each side by '-1'.
d = 16

Simplifying
d = 16

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