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k in (-oo:+oo)
3 = (1/3)*k // - (1/3)*k
3-((1/3)*k) = 0
(-1/3)*k+3 = 0
3-1/3*k = 0 // - 3
-1/3*k = -3 // : -1/3
k = -3/(-1/3)
k = 9
k = 9
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