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n in (-oo:+oo)
(4/5)*n+3.5 = 19.5 // - 19.5
(4/5)*n-19.5+3.5 = 0
4/5*n-16 = 0 // + 16
4/5*n = 16 // : 4/5
n = 16/4/5
n = 20
n = 20
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