7d+12=40

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Solution for 7d+12=40 equation: 



7d+12=40

We move all terms to the left:

7d+12-(40)=0

We add all the numbers together, and all the variables

7d-28=0

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

7d=28

d=28/7

d=4

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