12-d=9

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Solution for 12-d=9 equation:


Simplifying
12 + -1d = 9

Solving
12 + -1d = 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 + -1d = 9 + -12

Combine like terms: 12 + -12 = 0
0 + -1d = 9 + -12
-1d = 9 + -12

Combine like terms: 9 + -12 = -3
-1d = -3

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

Simplifying
d = 3

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