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n in (-oo:+oo)
(1/5)*n+8 = 79/10 // - 79/10
(1/5)*n-(79/10)+8 = 0
(1/5)*n-79/10+8 = 0
1/5*n+1/10 = 0 // - 1/10
1/5*n = -1/10 // : 1/5
n = -1/10/1/5
n = -1/2
n = -1/2
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