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n in (-oo:+oo)
(1/2)*n+6*n-(3/5) = -71/10 // + -71/10
(1/2)*n+6*n-(3/5)-(-71/10) = 0
(1/2)*n+6*n-3/5+71/10 = 0
13/2*n+13/2 = 0 // - 13/2
13/2*n = -13/2 // : 13/2
n = -13/2/13/2
n = -1
n = -1
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