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n in (-oo:+oo)
-3.4 = n/(-2) // - n/(-2)
-(n/(-2))-3.4 = 0
1/2*n-3.4 = 0 // + 3.4
1/2*n = 3.4 // : 1/2
n = 3.4/1/2
n = 6.8
n = 6.8
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