21=8d-9(2d+1)

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Solution for 21=8d-9(2d+1) equation:


Simplifying
21 = 8d + -9(2d + 1)

Reorder the terms:
21 = 8d + -9(1 + 2d)
21 = 8d + (1 * -9 + 2d * -9)
21 = 8d + (-9 + -18d)

Reorder the terms:
21 = -9 + 8d + -18d

Combine like terms: 8d + -18d = -10d
21 = -9 + -10d

Solving
21 = -9 + -10d

Solving for variable 'd'.

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

Add '10d' to each side of the equation.
21 + 10d = -9 + -10d + 10d

Combine like terms: -10d + 10d = 0
21 + 10d = -9 + 0
21 + 10d = -9

Add '-21' to each side of the equation.
21 + -21 + 10d = -9 + -21

Combine like terms: 21 + -21 = 0
0 + 10d = -9 + -21
10d = -9 + -21

Combine like terms: -9 + -21 = -30
10d = -30

Divide each side by '10'.
d = -3

Simplifying
d = -3

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