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n in (-oo:+oo)
(1/2)*n-3/5 = -31/10 // + -31/10
(1/2)*n-3/5-(-31/10) = 0
(1/2)*n-3/5+31/10 = 0
1/2*n+5/2 = 0 // - 5/2
1/2*n = -5/2 // : 1/2
n = -5/2/1/2
n = -5
n = -5
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