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k in (-oo:+oo)
(-5/8)*k = -1/3 // + -1/3
(-5/8)*k-(-1/3) = 0
(-5/8)*k+1/3 = 0
1/3-5/8*k = 0 // - 1/3
-5/8*k = -1/3 // : -5/8
k = -1/3/(-5/8)
k = 8/15
k = 8/15
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