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