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n in (-oo:+oo)
3/4 = n/75 // - n/75
3/4-(n/75) = 0
3/4-1/75*n = 0 // - 3/4
-1/75*n = -3/4 // : -1/75
n = -3/4/(-1/75)
n = 225/4
n = 225/4
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