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n in (-oo:+oo)
2*n-(3/3) = 5 // - 5
2*n-(3/3)-5 = 0
2*n-5-1 = 0
2*n-6 = 0 // + 6
2*n = 6 // : 2
n = 6/2
n = 3
n = 3
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