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x in (-oo:+oo)
f = 5*a-((15*b)/2) // - 5*a-((15*b)/2)
(15*b)/2-(5*a)+f = 0
(15*b)/2-5*a+f = 0
15/2*b-5*a+f = 0
x należy do R
x in (-oo:+oo)
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