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x in (-oo:+oo)
15-((1/8)*x) = -1 // + 1
1-((1/8)*x)+15 = 0
(-1/8)*x+1+15 = 0
16-1/8*x = 0 // - 16
-1/8*x = -16 // : -1/8
x = -16/(-1/8)
x = 128
x = 128
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