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n in (-oo:+oo)
4/70 = n/35 // - n/35
4/70-(n/35) = 0
2/35-1/35*n = 0 // - 2/35
-1/35*n = -2/35 // : -1/35
n = -2/35/(-1/35)
n = 2
n = 2
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