9=d*21

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Solution for 9=d*21 equation:


Simplifying
9 = d * 21

Reorder the terms for easier multiplication:
9 = 21d

Solving
9 = 21d

Solving for variable 'd'.

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

Add '-21d' to each side of the equation.
9 + -21d = 21d + -21d

Combine like terms: 21d + -21d = 0
9 + -21d = 0

Add '-9' to each side of the equation.
9 + -9 + -21d = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -21d = 0 + -9
-21d = 0 + -9

Combine like terms: 0 + -9 = -9
-21d = -9

Divide each side by '-21'.
d = 0.4285714286

Simplifying
d = 0.4285714286

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