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n in (-oo:+oo)
(10/3)*n-((5/2)*n) = 5/4 // - 5/4
(10/3)*n-((5/2)*n)-(5/4) = 0
(10/3)*n+(-5/2)*n-5/4 = 0
5/6*n-5/4 = 0 // + 5/4
5/6*n = 5/4 // : 5/6
n = 5/4/5/6
n = 3/2
n = 3/2
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