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x in (-oo:+oo)
N-25 = (1/3)*n-11 // - (1/3)*n-11
N-((1/3)*n)-25+11 = 0
N+(-1/3)*n-25+11 = 0
N-1/3*n-14 = 0
x należy do R
x in (-oo:+oo)
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