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k in (-oo:+oo)
5*k = -6*k-(2/7) // + -6*k-(2/7)
5*k-(-6*k)+2/7 = 0
5*k+6*k+2/7 = 0
11*k+2/7 = 0 // - 2/7
11*k = -2/7 // : 11
k = -2/7/11
k = -2/77
k = -2/77
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