D=4d+21

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Solution for D=4d+21 equation: 


Simplifying
D = 4d + 21

Reorder the terms:
D = 21 + 4d

Solving
D = 21 + 4d

Solving for variable 'D'.

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

Simplifying
D = 21 + 4d

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