12D-4D=40

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Solution for 12D-4D=40 equation: 


Simplifying
12D + -4D = 40

Combine like terms: 12D + -4D = 8D
8D = 40

Solving
8D = 40

Solving for variable 'D'.

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

Divide each side by '8'.
D = 5

Simplifying
D = 5

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