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n in (-oo:+oo)
3*n = 5-((9*n)/4) // - 5-((9*n)/4)
3*n+(9*n)/4-5 = 0
21/4*n-5 = 0 // + 5
21/4*n = 5 // : 21/4
n = 5/21/4
n = 20/21
n = 20/21
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