30+12d=90

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Solution for 30+12d=90 equation: 



30+12d=90

We move all terms to the left:

30+12d-(90)=0

We add all the numbers together, and all the variables

12d-60=0

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

12d=60

d=60/12

d=5

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