13(3d+6)=21

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Solution for 13(3d+6)=21 equation: 



13(3d+6)=21

We move all terms to the left:

13(3d+6)-(21)=0

We multiply parentheses

39d+78-21=0

We add all the numbers together, and all the variables

39d+57=0

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

39d=-57

d=-57/39

d=-1+6/13

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