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n in (-oo:+oo)
3*n-40 = (1/2)*n+35 // - (1/2)*n+35
3*n-((1/2)*n)-40-35 = 0
3*n+(-1/2)*n-40-35 = 0
5/2*n-75 = 0 // + 75
5/2*n = 75 // : 5/2
n = 75/5/2
n = 30
n = 30
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