15+7d=57

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Solution for 15+7d=57 equation: 



15+7d=57

We move all terms to the left:

15+7d-(57)=0

We add all the numbers together, and all the variables

7d-42=0

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

7d=42

d=42/7

d=6

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