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k in (-oo:+oo)
(4/15)*k = -8/15 // + -8/15
(4/15)*k-(-8/15) = 0
(4/15)*k+8/15 = 0
4/15*k+8/15 = 0 // - 8/15
4/15*k = -8/15 // : 4/15
k = -8/15/4/15
k = -2
k = -2
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