4d+5=21

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Solution for 4d+5=21 equation: 


d in (-oo:+oo)

4*d+5 = 21 // - 21

4*d-21+5 = 0

4*d-16 = 0 // + 16

4*d = 16 // : 4

d = 16/4

d = 4

d = 4

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