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k in (-oo:+oo)
2*k+2/5 = -4/15 // + -4/15
2*k+2/5-(-4/15) = 0
2*k+2/5+4/15 = 0
2*k+2/3 = 0 // - 2/3
2*k = -2/3 // : 2
k = -2/3/2
k = -1/3
k = -1/3
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