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