21-3d=12

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Solution for 21-3d=12 equation: 



21-3d=12

We move all terms to the left:

21-3d-(12)=0

We add all the numbers together, and all the variables

-3d+9=0

We move all terms containing d to the left, all other terms to the right

-3d=-9

d=-9/-3

d=+3

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