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k in (-oo:+oo)
7*k+2/9 = 506/9 // - 506/9
7*k+2/9-(506/9) = 0
7*k+2/9-506/9 = 0
7*k-56 = 0 // + 56
7*k = 56 // : 7
k = 56/7
k = 8
k = 8
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