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n in (-oo:+oo)
n+9 = -((3/2)*(4*n-4))-n // + -((3/2)*(4*n-4))-n
(3/2)*(4*n-4)+n+n+9 = 0
3/2*(4*n-4)+n+n+9 = 0
3/2*(4*n-4)+n+n+9 = 0
7*n+n-6+9 = 0
8*n-6+9 = 0
8*n+3 = 0
8*n+3 = 0
8*n+3 = 0 // - 3
8*n = -3 // : 8
n = -3/8
n = -3/8
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