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k in (-oo:+oo)
7*k = 63/10 // - 63/10
7*k-(63/10) = 0
7*k-63/10 = 0
7*k-63/10 = 0 // + 63/10
7*k = 63/10 // : 7
k = 63/10/7
k = 9/10
k = 9/10
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