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x in (-oo:+oo)
8*x = 20/8 // - 20/8
8*x-(20/8) = 0
8*x-5/2 = 0
8*x-5/2 = 0 // + 5/2
8*x = 5/2 // : 8
x = 5/2/8
x = 5/16
x = 5/16
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