d+21=-7d-3

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Solution for d+21=-7d-3 equation:


Simplifying
d + 21 = -7d + -3

Reorder the terms:
21 + d = -7d + -3

Reorder the terms:
21 + d = -3 + -7d

Solving
21 + d = -3 + -7d

Solving for variable 'd'.

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

Add '7d' to each side of the equation.
21 + d + 7d = -3 + -7d + 7d

Combine like terms: d + 7d = 8d
21 + 8d = -3 + -7d + 7d

Combine like terms: -7d + 7d = 0
21 + 8d = -3 + 0
21 + 8d = -3

Add '-21' to each side of the equation.
21 + -21 + 8d = -3 + -21

Combine like terms: 21 + -21 = 0
0 + 8d = -3 + -21
8d = -3 + -21

Combine like terms: -3 + -21 = -24
8d = -24

Divide each side by '8'.
d = -3

Simplifying
d = -3

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