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