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n in (-oo:+oo)
4/5 = n/45 // - n/45
4/5-(n/45) = 0
4/5-1/45*n = 0 // - 4/5
-1/45*n = -4/5 // : -1/45
n = -4/5/(-1/45)
n = 36
n = 36
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