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k in (-oo:+oo)
(-2/5)*k = -3/25 // + -3/25
(-2/5)*k-(-3/25) = 0
(-2/5)*k+3/25 = 0
3/25-2/5*k = 0 // - 3/25
-2/5*k = -3/25 // : -2/5
k = -3/25/(-2/5)
k = 3/10
k = 3/10
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