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