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n in (-oo:+oo)
28 = (2/3)*n // - (2/3)*n
28-((2/3)*n) = 0
(-2/3)*n+28 = 0
28-2/3*n = 0 // - 28
-2/3*n = -28 // : -2/3
n = -28/(-2/3)
n = 42
n = 42
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