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n in (-oo:+oo)
(5/2)*(2*n-4) = 35 // - 35
(5/2)*(2*n-4)-35 = 0
5/2*(2*n-4)-35 = 0
5/2*(2*n-4)-35 = 0
5*n-45 = 0
5*n-45 = 0
5*n-45 = 0 // + 45
5*n = 45 // : 5
n = 45/5
n = 9
n = 9
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