3+2d=12

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Solution for 3+2d=12 equation: 



3+2d=12

We move all terms to the left:

3+2d-(12)=0

We add all the numbers together, and all the variables

2d-9=0

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

2d=9

d=9/2

d=4+1/2

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