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