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n in (-oo:+oo)
(2*n)/5 = 1.5 // - 1.5
(2*n)/5-1.5 = 0
2/5*n-1.5 = 0 // + 1.5
2/5*n = 1.5 // : 2/5
n = 1.5/2/5
n = 3.75
n = 3.75
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