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n in (-oo:+oo)
(-2/3)*n-4 = -n-(103/27) // + -n-(103/27)
(-2/3)*n+n+103/27-4 = 0
1/3*n-5/27 = 0 // + 5/27
1/3*n = 5/27 // : 1/3
n = 5/27/1/3
n = 5/9
n = 5/9
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