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n in (-oo:+oo)
-2*n-(10/3) = 4*n // - 4*n
-2*n-(4*n)-(10/3) = 0
-2*n-4*n-10/3 = 0
-6*n-10/3 = 0 // + 10/3
-6*n = 10/3 // : -6
n = 10/3/(-6)
n = -5/9
n = -5/9
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