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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