D+21=28

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Solution for D+21=28 equation: 


Simplifying
D + 21 = 28

Reorder the terms:
21 + D = 28

Solving
21 + D = 28

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 + D = 28 + -21

Combine like terms: 21 + -21 = 0
0 + D = 28 + -21
D = 28 + -21

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

Simplifying
D = 7

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