21=4k+k+1

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Solution for 21=4k+k+1 equation: 


k in (-oo:+oo)

21 = 4*k+k+1 // - 4*k+k+1

21-(4*k)-k-1 = 0

21-4*k-k-1 = 0

20-5*k = 0 // - 20

-5*k = -20 // : -5

k = -20/(-5)

k = 4

k = 4

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