-9-4d=-21

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Solution for -9-4d=-21 equation:


d in (-oo:+oo)

-(4*d)-9 = -21 // + 21

21-(4*d)-9 = 0

21-4*d-9 = 0

12-4*d = 0 // - 12

-4*d = -12 // : -4

d = -12/(-4)

d = 3

d = 3

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