21=4d+2d+3

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Solution for 21=4d+2d+3 equation: 


d in (-oo:+oo)

21 = 4*d+2*d+3 // - 4*d+2*d+3

21-(4*d)-(2*d)-3 = 0

21-4*d-2*d-3 = 0

18-6*d = 0 // - 18

-6*d = -18 // : -6

d = -18/(-6)

d = 3

d = 3

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