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k in (-oo:+oo)
(2*3*k)/8 = -15/32 // + -15/32
(2*3*k)/8-(-15/32) = 0
(2*3*k)/8+15/32 = 0
3/4*k+15/32 = 0 // - 15/32
3/4*k = -15/32 // : 3/4
k = -15/32/3/4
k = -5/8
k = -5/8
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