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n in (-oo:+oo)
(2/5)*n+(1/6)*n+2 = 29/6 // - 29/6
(2/5)*n+(1/6)*n-(29/6)+2 = 0
(2/5)*n+(1/6)*n-29/6+2 = 0
17/30*n-17/6 = 0 // + 17/6
17/30*n = 17/6 // : 17/30
n = 17/6/17/30
n = 5
n = 5
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