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n in (-oo:+oo)
(3/8)*n-(1/4) = 0
(3/8)*n-1/4 = 0
3/8*n-1/4 = 0 // + 1/4
3/8*n = 1/4 // : 3/8
n = 1/4/3/8
n = 2/3
n = 2/3
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