21=(3-9d)6

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Solution for 21=(3-9d)6 equation:


Simplifying
21 = (3 + -9d) * 6

Reorder the terms for easier multiplication:
21 = 6(3 + -9d)
21 = (3 * 6 + -9d * 6)
21 = (18 + -54d)

Solving
21 = 18 + -54d

Solving for variable 'd'.

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

Add '54d' to each side of the equation.
21 + 54d = 18 + -54d + 54d

Combine like terms: -54d + 54d = 0
21 + 54d = 18 + 0
21 + 54d = 18

Add '-21' to each side of the equation.
21 + -21 + 54d = 18 + -21

Combine like terms: 21 + -21 = 0
0 + 54d = 18 + -21
54d = 18 + -21

Combine like terms: 18 + -21 = -3
54d = -3

Divide each side by '54'.
d = -0.05555555556

Simplifying
d = -0.05555555556

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