-4d+5=21

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Solution for -4d+5=21 equation: 


d in (-oo:+oo)

5-4*d = 21 // - 21

5-4*d-21 = 0

-4*d-16 = 0 // + 16

-4*d = 16 // : -4

d = 16/(-4)

d = -4

d = -4

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