12.5-0.5d=30

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Solution for 12.5-0.5d=30 equation: 



12.5-0.5d=30

We move all terms to the left:

12.5-0.5d-(30)=0

We add all the numbers together, and all the variables

-0.5d-17.5=0

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

-0.5d=17.5

d=17.5/-0.5

d=-35

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