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k in (-oo:+oo)
(3/4)*k-(1/8) = 0
(3/4)*k-1/8 = 0
3/4*k-1/8 = 0 // + 1/8
3/4*k = 1/8 // : 3/4
k = 1/8/3/4
k = 1/6
k = 1/6
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