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k in (-oo:+oo)
1-((3/4)*k) = 7/8 // - 7/8
1-((3/4)*k)-(7/8) = 0
(-3/4)*k-7/8+1 = 0
1/8-3/4*k = 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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