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n in (-oo:+oo)
4/3 = n/45 // - n/45
4/3-(n/45) = 0
4/3-1/45*n = 0 // - 4/3
-1/45*n = -4/3 // : -1/45
n = -4/3/(-1/45)
n = 60
n = 60
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