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x in (-oo:+oo)
(1/8)*x = 2/5 // - 2/5
(1/8)*x-(2/5) = 0
(1/8)*x-2/5 = 0
1/8*x-2/5 = 0 // + 2/5
1/8*x = 2/5 // : 1/8
x = 2/5/1/8
x = 16/5
x = 16/5
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