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