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k in (-oo:+oo)
k/2 = -5/7 // + -5/7
k/2-(-5/7) = 0
k/2+5/7 = 0
1/2*k+5/7 = 0 // - 5/7
1/2*k = -5/7 // : 1/2
k = -5/7/1/2
k = -10/7
k = -10/7
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