D+9=2-21

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Solution for D+9=2-21 equation: 


Simplifying
D + 9 = 2 + -21

Reorder the terms:
9 + D = 2 + -21

Combine like terms: 2 + -21 = -19
9 + D = -19

Solving
9 + D = -19

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 + D = -19 + -9

Combine like terms: 9 + -9 = 0
0 + D = -19 + -9
D = -19 + -9

Combine like terms: -19 + -9 = -28
D = -28

Simplifying
D = -28

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