6d-9d=21

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Solution for 6d-9d=21 equation: 


Simplifying
6d + -9d = 21

Combine like terms: 6d + -9d = -3d
-3d = 21

Solving
-3d = 21

Solving for variable 'd'.

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

Divide each side by '-3'.
d = -7

Simplifying
d = -7

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