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n in (-oo:+oo)
6*n+10 = 3*n+25 // - 3*n+25
6*n-(3*n)-25+10 = 0
6*n-3*n-25+10 = 0
3*n-15 = 0 // + 15
3*n = 15 // : 3
n = 15/3
n = 5
n = 5
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