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