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n in (-oo:+oo)
28/3-((4/3)*n) = 12 // - 12
28/3-((4/3)*n)-12 = 0
(-4/3)*n+28/3-12 = 0
-4/3*n-8/3 = 0 // + 8/3
-4/3*n = 8/3 // : -4/3
n = 8/3/(-4/3)
n = -2
n = -2
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