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k in (-oo:+oo)
4*(10-(4*k)) = -72 // + 72
4*(10-(4*k))+72 = 0
4*(10-4*k)+72 = 0
4*(10-4*k)+72 = 0
112-16*k = 0
112-16*k = 0
112-16*k = 0 // - 112
-16*k = -112 // : -16
k = -112/(-16)
k = 7
k = 7
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