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x in (-oo:+oo)
-8 = x/8-3 // - x/8-3
3-(x/8)-8 = 0
-1/8*x-5 = 0 // + 5
-1/8*x = 5 // : -1/8
x = 5/(-1/8)
x = -40
x = -40
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