21X^2-7D=0

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Solution for 21X^2-7D=0 equation: 


Simplifying
21X2 + -7D = 0

Reorder the terms:
-7D + 21X2 = 0

Solving
-7D + 21X2 = 0

Solving for variable 'D'.

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

Add '-21X2' to each side of the equation.
-7D + 21X2 + -21X2 = 0 + -21X2

Combine like terms: 21X2 + -21X2 = 0
-7D + 0 = 0 + -21X2
-7D = 0 + -21X2
Remove the zero:
-7D = -21X2

Divide each side by '-7'.
D = 3X2

Simplifying
D = 3X2

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