-7d-9=-30

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Solution for -7d-9=-30 equation: 


Simplifying
-7d + -9 = -30

Reorder the terms:
-9 + -7d = -30

Solving
-9 + -7d = -30

Solving for variable 'd'.

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

Add '9' to each side of the equation.
-9 + 9 + -7d = -30 + 9

Combine like terms: -9 + 9 = 0
0 + -7d = -30 + 9
-7d = -30 + 9

Combine like terms: -30 + 9 = -21
-7d = -21

Divide each side by '-7'.
d = 3

Simplifying
d = 3

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