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n in (-oo:+oo)
(2/5)*(2*n-20)+6 = 10 // - 10
(2/5)*(2*n-20)-10+6 = 0
2/5*(2*n-20)-10+6 = 0
2/5*(2*n-20)-10+6 = 0
4/5*n-18+6 = 0
4/5*n-12 = 0
4/5*n-12 = 0
4/5*n-12 = 0 // + 12
4/5*n = 12 // : 4/5
n = 12/4/5
n = 15
n = 15
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