D/-15=-21 - solution

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Solution for D/-15=-21 equation:

D in (-oo:+oo)

D/(-15) = -21 // + 21

D/(-15)+21 = 0

21-1/15*D = 0 // - 21

-1/15*D = -21 // : -1/15

D = -21/(-1/15)

D = 315

D = 315

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