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48=12d-7

We move all terms to the left:

48-(12d-7)=0

We get rid of parentheses

-12d+7+48=0

We add all the numbers together, and all the variables

-12d+55=0

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

-12d=-55

d=-55/-12

d=4+7/12

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