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