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n in (-oo:+oo)
(2/3)*n+(22/3)*n+4 = (1/3)*n+25 // - (1/3)*n+25
(2/3)*n+(22/3)*n-((1/3)*n)-25+4 = 0
(2/3)*n+(22/3)*n+(-1/3)*n-25+4 = 0
23/3*n-21 = 0 // + 21
23/3*n = 21 // : 23/3
n = 21/23/3
n = 63/23
n = 63/23
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