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n in (-oo:+oo)
(1/2)*n+n+10 = 35/2 // - 35/2
(1/2)*n+n-(35/2)+10 = 0
(1/2)*n+n-35/2+10 = 0
3/2*n-15/2 = 0 // + 15/2
3/2*n = 15/2 // : 3/2
n = 15/2/3/2
n = 5
n = 5
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