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n in (-oo:+oo)
4/3 = n/15 // - n/15
4/3-(n/15) = 0
4/3-1/15*n = 0 // - 4/3
-1/15*n = -4/3 // : -1/15
n = -4/3/(-1/15)
n = 20
n = 20
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