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k in (-oo:+oo)
8*k = -12/32 // + -12/32
8*k-(-12/32) = 0
8*k+3/8 = 0
8*k+3/8 = 0 // - 3/8
8*k = -3/8 // : 8
k = -3/8/8
k = -3/64
k = -3/64
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