21=d*77

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Solution for 21=d*77 equation:


Simplifying
21 = d * 77

Reorder the terms for easier multiplication:
21 = 77d

Solving
21 = 77d

Solving for variable 'd'.

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

Add '-77d' to each side of the equation.
21 + -77d = 77d + -77d

Combine like terms: 77d + -77d = 0
21 + -77d = 0

Add '-21' to each side of the equation.
21 + -21 + -77d = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -77d = 0 + -21
-77d = 0 + -21

Combine like terms: 0 + -21 = -21
-77d = -21

Divide each side by '-77'.
d = 0.2727272727

Simplifying
d = 0.2727272727

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