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n in (-oo:+oo)
-3/2 = 3*n // - 3*n
-(3*n)-3/2 = 0
-3*n-3/2 = 0
-3*n-3/2 = 0 // + 3/2
-3*n = 3/2 // : -3
n = 3/2/(-3)
n = -1/2
n = -1/2
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