21=9+2(d-3)

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Solution for 21=9+2(d-3) equation:


Simplifying
21 = 9 + 2(d + -3)

Reorder the terms:
21 = 9 + 2(-3 + d)
21 = 9 + (-3 * 2 + d * 2)
21 = 9 + (-6 + 2d)

Combine like terms: 9 + -6 = 3
21 = 3 + 2d

Solving
21 = 3 + 2d

Solving for variable 'd'.

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

Add '-2d' to each side of the equation.
21 + -2d = 3 + 2d + -2d

Combine like terms: 2d + -2d = 0
21 + -2d = 3 + 0
21 + -2d = 3

Add '-21' to each side of the equation.
21 + -21 + -2d = 3 + -21

Combine like terms: 21 + -21 = 0
0 + -2d = 3 + -21
-2d = 3 + -21

Combine like terms: 3 + -21 = -18
-2d = -18

Divide each side by '-2'.
d = 9

Simplifying
d = 9

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