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n in (-oo:+oo)
-2*n-(4/5) = 7/10 // - 7/10
-2*n-(4/5)-(7/10) = 0
-2*n-4/5-7/10 = 0
-2*n-3/2 = 0 // + 3/2
-2*n = 3/2 // : -2
n = 3/2/(-2)
n = -3/4
n = -3/4
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