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