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k in (-oo:+oo)
-((3/4)*k)-1 = -25/16 // + -25/16
-((3/4)*k)-(-25/16)-1 = 0
(-3/4)*k+25/16-1 = 0
9/16-3/4*k = 0 // - 9/16
-3/4*k = -9/16 // : -3/4
k = -9/16/(-3/4)
k = 3/4
k = 3/4
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