d/-3=-7 - solution

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Solution for d/-3=-7 equation:

d in (-oo:+oo)

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

d/(-3)+7 = 0

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

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

d = -7/(-1/3)

d = 21

d = 21

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