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