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x in (-oo:+oo)
(5/2)*x = 2/5 // - 2/5
(5/2)*x-(2/5) = 0
(5/2)*x-2/5 = 0
5/2*x-2/5 = 0 // + 2/5
5/2*x = 2/5 // : 5/2
x = 2/5/5/2
x = 4/25
x = 4/25
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