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k in (-oo:+oo)
7*k+2 = 38/5 // - 38/5
7*k-(38/5)+2 = 0
7*k-38/5+2 = 0
7*k-28/5 = 0 // + 28/5
7*k = 28/5 // : 7
k = 28/5/7
k = 4/5
k = 4/5
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