15=k/21

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Solution for 15=k/21 equation: 


k in (-oo:+oo)

15 = k/21 // - k/21

15-(k/21) = 0

15-1/21*k = 0 // - 15

-1/21*k = -15 // : -1/21

k = -15/(-1/21)

k = 315

k = 315

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