-42=-7d+7

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Solution for -42=-7d+7 equation: 



-42=-7d+7

We move all terms to the left:

-42-(-7d+7)=0

We get rid of parentheses

7d-7-42=0

We add all the numbers together, and all the variables

7d-49=0

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

7d=49

d=49/7

d=7

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