21-3D=15

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Solution for 21-3D=15 equation: 


Simplifying
21 + -3D = 15

Solving
21 + -3D = 15

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 + -3D = 15 + -21

Combine like terms: 21 + -21 = 0
0 + -3D = 15 + -21
-3D = 15 + -21

Combine like terms: 15 + -21 = -6
-3D = -6

Divide each side by '-3'.
D = 2

Simplifying
D = 2

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