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k in (-oo:+oo)
1-((3/4)*k) = -5/4 // + -5/4
1-((3/4)*k)-(-5/4) = 0
(-3/4)*k+5/4+1 = 0
9/4-3/4*k = 0 // - 9/4
-3/4*k = -9/4 // : -3/4
k = -9/4/(-3/4)
k = 3
k = 3
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