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n in (-oo:+oo)
-6 = 2*n-(3/4) // - 2*n-(3/4)
3/4-(2*n)-6 = 0
3/4-2*n-6 = 0
-2*n-21/4 = 0 // + 21/4
-2*n = 21/4 // : -2
n = 21/4/(-2)
n = -21/8
n = -21/8
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