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x in (-oo:+oo)
(-1/8)*x-5 = -1 // + 1
(-1/8)*x-5+1 = 0
-1/8*x-4 = 0 // + 4
-1/8*x = 4 // : -1/8
x = 4/(-1/8)
x = -32
x = -32
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