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k in (-oo:+oo)
(1/3)*k = 5/33 // - 5/33
(1/3)*k-(5/33) = 0
(1/3)*k-5/33 = 0
1/3*k-5/33 = 0 // + 5/33
1/3*k = 5/33 // : 1/3
k = 5/33/1/3
k = 5/11
k = 5/11
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