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n in (-oo:+oo)
6*n = 9/2 // - 9/2
6*n-(9/2) = 0
6*n-9/2 = 0
6*n-9/2 = 0 // + 9/2
6*n = 9/2 // : 6
n = 9/2/6
n = 3/4
n = 3/4
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