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k in (-oo:+oo)
5*k = 35/9 // - 35/9
5*k-(35/9) = 0
5*k-35/9 = 0
5*k-35/9 = 0 // + 35/9
5*k = 35/9 // : 5
k = 35/9/5
k = 7/9
k = 7/9
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