d/-3=21

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Solution for d/-3=21 equation: 


d in (-oo:+oo)

d/(-3) = 21 // - 21

d/(-3)-21 = 0

-1/3*d-21 = 0 // + 21

-1/3*d = 21 // : -1/3

d = 21/(-1/3)

d = -63

d = -63

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