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k in (-oo:+oo)
k/2 = -3/7 // + -3/7
k/2-(-3/7) = 0
k/2+3/7 = 0
1/2*k+3/7 = 0 // - 3/7
1/2*k = -3/7 // : 1/2
k = -3/7/1/2
k = -6/7
k = -6/7
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