D=2b-4a

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Solution for D=2b-4a equation: 


Simplifying
D = 2b + -4a

Reorder the terms:
D = -4a + 2b

Solving
D = -4a + 2b

Solving for variable 'D'.

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

Simplifying
D = -4a + 2b

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