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n in (-oo:+oo)
3/5 = n/75 // - n/75
3/5-(n/75) = 0
3/5-1/75*n = 0 // - 3/5
-1/75*n = -3/5 // : -1/75
n = -3/5/(-1/75)
n = 45
n = 45
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