7d+15=99

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Solution for 7d+15=99 equation: 



7d+15=99

We move all terms to the left:

7d+15-(99)=0

We add all the numbers together, and all the variables

7d-84=0

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

7d=84

d=84/7

d=12

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