D+30=9

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Solution for D+30=9 equation: 


Simplifying
D + 30 = 9

Reorder the terms:
30 + D = 9

Solving
30 + D = 9

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 + D = 9 + -30

Combine like terms: 30 + -30 = 0
0 + D = 9 + -30
D = 9 + -30

Combine like terms: 9 + -30 = -21
D = -21

Simplifying
D = -21

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