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n in (-oo:+oo)
(2/5)*n+(3/5)*n+5/6 = 7/4 // - 7/4
(2/5)*n+(3/5)*n+5/6-(7/4) = 0
(2/5)*n+(3/5)*n+5/6-7/4 = 0
n-11/12 = 0 // + 11/12
n = 11/12
n = 11/12
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