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k in (-oo:+oo)
(-3/8)*k = -4 // + 4
(-3/8)*k+4 = 0
4-3/8*k = 0 // - 4
-3/8*k = -4 // : -3/8
k = -4/(-3/8)
k = 32/3
k = 32/3
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