12+d=21

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Solution for 12+d=21 equation: 


Simplifying
12 + d = 21

Solving
12 + d = 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 + d = 21 + -12

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

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

Simplifying
d = 9

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