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n in (-oo:+oo)
4/5 = n/75 // - n/75
4/5-(n/75) = 0
4/5-1/75*n = 0 // - 4/5
-1/75*n = -4/5 // : -1/75
n = -4/5/(-1/75)
n = 60
n = 60
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