7d=d-42

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Solution for 7d=d-42 equation: 



7d=d-42

We move all terms to the left:

7d-(d-42)=0

We get rid of parentheses

7d-d+42=0

We add all the numbers together, and all the variables

6d+42=0

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

6d=-42

d=-42/6

d=-7

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