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n in (-oo:+oo)
(4/5)*n-((2/3)*n)+3 = 1/2-(3*n) // - 1/2-(3*n)
(4/5)*n-((2/3)*n)+3*n-(1/2)+3 = 0
(4/5)*n+(-2/3)*n+3*n-1/2+3 = 0
47/15*n+5/2 = 0 // - 5/2
47/15*n = -5/2 // : 47/15
n = -5/2/47/15
n = -75/94
n = -75/94
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