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n in (-oo:+oo)
3*n-((2/4)*n)-3 = 0
3*n+(-1/2)*n-3 = 0
5/2*n-3 = 0 // + 3
5/2*n = 3 // : 5/2
n = 3/5/2
n = 6/5
n = 6/5
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