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