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x in (-oo:+oo)
((1*a)/5)*b = 9/20 // - 9/20
((1*a)/5)*b-(9/20) = 0
(a/5)*b-9/20 = 0
1/5*a*b-9/20 = 0
x należy do R
x in (-oo:+oo)
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