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k in (-oo:+oo)
7*k+2 = 78/11 // - 78/11
7*k-(78/11)+2 = 0
7*k-78/11+2 = 0
7*k-56/11 = 0 // + 56/11
7*k = 56/11 // : 7
k = 56/11/7
k = 8/11
k = 8/11
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