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n in (-oo:+oo)
3*n-(3/4) = 5*n // - 5*n
3*n-(5*n)-(3/4) = 0
3*n-5*n-3/4 = 0
-2*n-3/4 = 0 // + 3/4
-2*n = 3/4 // : -2
n = 3/4/(-2)
n = -3/8
n = -3/8
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