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k in (-oo:+oo)
-9 = -(k/8)-2 // + -(k/8)-2
k/8-9+2 = 0
1/8*k-7 = 0 // + 7
1/8*k = 7 // : 1/8
k = 7/1/8
k = 56
k = 56
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