12-3d=9

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Solution for 12-3d=9 equation: 


Simplifying
12 + -3d = 9

Solving
12 + -3d = 9

Solving for variable 'd'.

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

Add '-12' to each side of the equation.
12 + -12 + -3d = 9 + -12

Combine like terms: 12 + -12 = 0
0 + -3d = 9 + -12
-3d = 9 + -12

Combine like terms: 9 + -12 = -3
-3d = -3

Divide each side by '-3'.
d = 1

Simplifying
d = 1

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