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x in (-oo:+oo)
N/5-((3*m)/10) = 1/5 // - 1/5
N/5-((3*m)/10)-(1/5) = 0
N/5+(-3/10)*m-1/5 = 0
1/5*N-3/10*m-1/5 = 0
x należy do R
x in (-oo:+oo)
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