d/-3=7

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Solution for d/-3=7 equation: 


d in (-oo:+oo)

d/(-3) = 7 // - 7

d/(-3)-7 = 0

-1/3*d-7 = 0 // + 7

-1/3*d = 7 // : -1/3

d = 7/(-1/3)

d = -21

d = -21

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