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x in (-oo:+oo)
-13 = x/8-3 // - x/8-3
3-(x/8)-13 = 0
-1/8*x-10 = 0 // + 10
-1/8*x = 10 // : -1/8
x = 10/(-1/8)
x = -80
x = -80
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