21=-d+3-d

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Solution for 21=-d+3-d equation:


Simplifying
21 = -1d + 3 + -1d

Reorder the terms:
21 = 3 + -1d + -1d

Combine like terms: -1d + -1d = -2d
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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