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n in (-oo:+oo)
3*n-40 = (1/2)*n+17 // - (1/2)*n+17
3*n-((1/2)*n)-40-17 = 0
3*n+(-1/2)*n-40-17 = 0
5/2*n-57 = 0 // + 57
5/2*n = 57 // : 5/2
n = 57/5/2
n = 114/5
n = 114/5
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