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