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k in (-oo:+oo)
4*k+k+3/4 = 23/4 // - 23/4
4*k+k+3/4-(23/4) = 0
4*k+k+3/4-23/4 = 0
5*k-5 = 0 // + 5
5*k = 5 // : 5
k = 5/5
k = 1
k = 1
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