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n in (-oo:+oo)
3-(n/2) = 3/4 // - 3/4
3-(n/2)-(3/4) = 0
3-(n/2)-3/4 = 0
9/4-1/2*n = 0 // - 9/4
-1/2*n = -9/4 // : -1/2
n = -9/4/(-1/2)
n = 9/2
n = 9/2
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