15/21=k/56

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Solution for 15/21=k/56 equation: 


k in (-oo:+oo)

15/21 = k/56 // - k/56

15/21-(k/56) = 0

5/7-1/56*k = 0 // - 5/7

-1/56*k = -5/7 // : -1/56

k = -5/7/(-1/56)

k = 40

k = 40

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