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k in (-oo:+oo)
7*(-7*k-9) = -112 // + 112
7*(-7*k-9)+112 = 0
7*(-7*k-9)+112 = 0
49-49*k = 0
49-49*k = 0
49-49*k = 0 // - 49
-49*k = -49 // : -49
k = -49/(-49)
k = 1
k = 1
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