12=2d+9

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Solution for 12=2d+9 equation: 



12=2d+9

We move all terms to the left:

12-(2d+9)=0

We get rid of parentheses

-2d-9+12=0

We add all the numbers together, and all the variables

-2d+3=0

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

-2d=-3

d=-3/-2

d=1+1/2

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