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