9D-3-4D=42

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Solution for 9D-3-4D=42 equation: 


Simplifying
9D + -3 + -4D = 42

Reorder the terms:
-3 + 9D + -4D = 42

Combine like terms: 9D + -4D = 5D
-3 + 5D = 42

Solving
-3 + 5D = 42

Solving for variable 'D'.

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

Add '3' to each side of the equation.
-3 + 3 + 5D = 42 + 3

Combine like terms: -3 + 3 = 0
0 + 5D = 42 + 3
5D = 42 + 3

Combine like terms: 42 + 3 = 45
5D = 45

Divide each side by '5'.
D = 9

Simplifying
D = 9

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