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