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k in (-oo:+oo)
8-(7*k) = 71 // - 71
8-(7*k)-71 = 0
8-7*k-71 = 0
-7*k-63 = 0 // + 63
-7*k = 63 // : -7
k = 63/(-7)
k = -9
k = -9
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