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n in (-oo:+oo)
1/2-3*n = -53/2 // + -53/2
1/2-3*n-(-53/2) = 0
1/2-3*n+53/2 = 0
27-3*n = 0 // - 27
-3*n = -27 // : -3
n = -27/(-3)
n = 9
n = 9
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