21+7d=-7

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Solution for 21+7d=-7 equation: 


Simplifying
21 + 7d = -7

Solving
21 + 7d = -7

Solving for variable 'd'.

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

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

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

Combine like terms: -7 + -21 = -28
7d = -28

Divide each side by '7'.
d = -4

Simplifying
d = -4

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