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x in (-oo:+oo)
7*r-((7*q)/p) = 2*r // - 2*r
7*r-((7*q)/p)-(2*r) = 0
7*r-7*p^-1*q-2*r = 0
5*r-7*p^-1*q = 0
x należy do R
x in (-oo:+oo)
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