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n in (-oo:+oo)
4/40 = n/35 // - n/35
4/40-(n/35) = 0
1/10-1/35*n = 0 // - 1/10
-1/35*n = -1/10 // : -1/35
n = -1/10/(-1/35)
n = 7/2
n = 7/2
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