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n in (-oo:+oo)
n/40 = 3/8 // - 3/8
n/40-(3/8) = 0
n/40-3/8 = 0
1/40*n-3/8 = 0 // + 3/8
1/40*n = 3/8 // : 1/40
n = 3/8/1/40
n = 15
n = 15
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