12-d=21

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Solution for 12-d=21 equation:


Simplifying
12 + -1d = 21

Solving
12 + -1d = 21

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 = 21 + -12

Combine like terms: 12 + -12 = 0
0 + -1d = 21 + -12
-1d = 21 + -12

Combine like terms: 21 + -12 = 9
-1d = 9

Divide each side by '-1'.
d = -9

Simplifying
d = -9

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