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n in (-oo:+oo)
10-2*n = 28/3 // - 28/3
10-2*n-(28/3) = 0
10-2*n-28/3 = 0
2/3-2*n = 0 // - 2/3
-2*n = -2/3 // : -2
n = -2/3/(-2)
n = 1/3
n = 1/3
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