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