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n in (-oo:+oo)
(3*n)/10 = 3/2 // - 3/2
(3*n)/10-(3/2) = 0
(3*n)/10-3/2 = 0
3/10*n-3/2 = 0 // + 3/2
3/10*n = 3/2 // : 3/10
n = 3/2/3/10
n = 5
n = 5
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