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n in (-oo:+oo)
(2/5)*n = 3*(1/5) // - 3*(1/5)
(2/5)*n-(3*(1/5)) = 0
(2/5)*n-3/5 = 0
2/5*n-3/5 = 0 // + 3/5
2/5*n = 3/5 // : 2/5
n = 3/5/2/5
n = 3/2
n = 3/2
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