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n in (-oo:+oo)
4*n-(1/3) = 9 // - 9
4*n-(1/3)-9 = 0
4*n-1/3-9 = 0
4*n-28/3 = 0 // + 28/3
4*n = 28/3 // : 4
n = 28/3/4
n = 7/3
n = 7/3
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