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x in (-oo:+oo)
4*c-(c*((9*d)/4)) = c-((2*d)/d) // - c-((2*d)/d)
4*c-c-(c*((9*d)/4))+(2*d)/d = 0
4*c-c+(-9/4)*c*d+(2*d)/d = 0
3*c-9/4*c*d+2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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