-3d=-21

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Solution for -3d=-21 equation: 


d in (-oo:+oo)

-3*d = -21 // + 21

21-3*d = 0

21-3*d = 0 // - 21

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

d = -21/(-3)

d = 7

d = 7

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