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n in (-oo:+oo)
4*n = (1/2)*(2*n-12) // - (1/2)*(2*n-12)
4*n-((1/2)*(2*n-12)) = 0
(-1/2)*(2*n-12)+4*n = 0
4*n-1/2*(2*n-12) = 0
4*n-1/2*(2*n-12) = 0
3*n+6 = 0
3*n+6 = 0
3*n+6 = 0 // - 6
3*n = -6 // : 3
n = -6/3
n = -2
n = -2
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