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n in (-oo:+oo)
(2/5)*n+(2/5)*n-1/10 = 19/2 // - 19/2
(2/5)*n+(2/5)*n-1/10-(19/2) = 0
(2/5)*n+(2/5)*n-1/10-19/2 = 0
4/5*n-48/5 = 0 // + 48/5
4/5*n = 48/5 // : 4/5
n = 48/5/4/5
n = 12
n = 12
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