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