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k in (-oo:+oo)
8-((3/8)*k) = -4 // + 4
4-((3/8)*k)+8 = 0
(-3/8)*k+4+8 = 0
12-3/8*k = 0 // - 12
-3/8*k = -12 // : -3/8
k = -12/(-3/8)
k = 32
k = 32
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