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x in (-oo:+oo)
8*z-(1/4) = 7/a // - 7/a
8*z-(7/a)-(1/4) = 0
8*z-7*a^-1-1/4 = 0
8*z-7*a^-1-1/4 = 0
x należy do R
x in (-oo:+oo)
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