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k in (-oo:+oo)
6*k+(3/4)*k-1 = -193/4 // + -193/4
6*k+(3/4)*k-(-193/4)-1 = 0
6*k+(3/4)*k+193/4-1 = 0
27/4*k+189/4 = 0 // - 189/4
27/4*k = -189/4 // : 27/4
k = -189/4/27/4
k = -7
k = -7
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