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4-((5/2)*b) = a^8-(5*b) // - a^8-(5*b)
5*b-a^8-((5/2)*b)+4 = 0
(-5/2)*b-a^8+5*b+4 = 0
5/2*b-a^8+4 = 0
x należy do R
x in (-oo:+oo)
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