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x in (-oo:+oo)
(2/5)*x = 4/10 // - 4/10
(2/5)*x-(4/10) = 0
(2/5)*x-2/5 = 0
2/5*x-2/5 = 0 // + 2/5
2/5*x = 2/5 // : 2/5
x = 2/5/2/5
x = 1
x = 1
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