30-3d=-21

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Solution for 30-3d=-21 equation: 


Simplifying
30 + -3d = -21

Solving
30 + -3d = -21

Solving for variable 'd'.

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

Add '-30' to each side of the equation.
30 + -30 + -3d = -21 + -30

Combine like terms: 30 + -30 = 0
0 + -3d = -21 + -30
-3d = -21 + -30

Combine like terms: -21 + -30 = -51
-3d = -51

Divide each side by '-3'.
d = 17

Simplifying
d = 17

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