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