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k in (-oo:+oo)
7-((3/4)*k) = 19/4 // - 19/4
7-((3/4)*k)-(19/4) = 0
(-3/4)*k-19/4+7 = 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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