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n in (-oo:+oo)
4/15 = (2/3)*n // - (2/3)*n
4/15-((2/3)*n) = 0
(-2/3)*n+4/15 = 0
4/15-2/3*n = 0 // - 4/15
-2/3*n = -4/15 // : -2/3
n = -4/15/(-2/3)
n = 2/5
n = 2/5
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