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k in (-oo:+oo)
2*k+3/5 = -3/5 // + -3/5
2*k+3/5-(-3/5) = 0
2*k+3/5+3/5 = 0
2*k+6/5 = 0 // - 6/5
2*k = -6/5 // : 2
k = -6/5/2
k = -3/5
k = -3/5
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