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k in (-oo:+oo)
4*k = 83/11 // - 83/11
4*k-(83/11) = 0
4*k-83/11 = 0
4*k-83/11 = 0 // + 83/11
4*k = 83/11 // : 4
k = 83/11/4
k = 83/44
k = 83/44
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