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k in (-oo:+oo)
4*(7-4*k) = 92 // - 92
4*(7-4*k)-92 = 0
4*(7-4*k)-92 = 0
-16*k-64 = 0
-16*k-64 = 0
-16*k-64 = 0 // + 64
-16*k = 64 // : -16
k = 64/(-16)
k = -4
k = -4
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