-d+7=28+6d

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Solution for -d+7=28+6d equation: 


d in (-oo:+oo)

7-d = 6*d+28 // - 6*d+28

7-d-(6*d)-28 = 0

7-d-6*d-28 = 0

-7*d-21 = 0 // + 21

-7*d = 21 // : -7

d = 21/(-7)

d = -3

d = -3

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