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k in (-oo:+oo)
-39/11 = -2*k-(5*k)-8 // + -2*k-(5*k)-8
5*k-(-2*k)-39/11+8 = 0
2*k+5*k-39/11+8 = 0
7*k+49/11 = 0 // - 49/11
7*k = -49/11 // : 7
k = -49/11/7
k = -7/11
k = -7/11
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