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x in (-oo:+oo)
N/9-((5*n)/8) = 1-9 // - 1-9
N/9-((5*n)/8)-1+9 = 0
N/9+(-5/8)*n-1+9 = 0
1/9*N-5/8*n+8 = 0
x należy do R
x in (-oo:+oo)
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