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n in (-oo:+oo)
(2/5)*(2*n-5) = 6 // - 6
(2/5)*(2*n-5)-6 = 0
2/5*(2*n-5)-6 = 0
2/5*(2*n-5)-6 = 0
4/5*n-8 = 0
4/5*n-8 = 0
4/5*n-8 = 0 // + 8
4/5*n = 8 // : 4/5
n = 8/4/5
n = 10
n = 10
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