3d+9=0

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Solution for 3d+9=0 equation: 


Simplifying
3d + 9 = 0

Reorder the terms:
9 + 3d = 0

Solving
9 + 3d = 0

Solving for variable 'd'.

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

Add '-9' to each side of the equation.
9 + -9 + 3d = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 3d = 0 + -9
3d = 0 + -9

Combine like terms: 0 + -9 = -9
3d = -9

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

Simplifying
d = -3

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