(4х-(12х/х-2)):(х-(8х-25/х-2))=((4х•(х-2)-12х)/(х-2)):((х•(х-2)-8х+25)/(х-2))=((4х^2-8х-12х)/(х-2)):((х^2-2х-8х+25)/(х-2))=((4х^2-20х)/(х-2)):((х^2-10х+25)/(х-2))=(4х^2-20х)/(х^2-10х+25)=(4х•(х-5))/((х-5)^2)=4х/(х-5), х=5 1/4=21/4, ((4•(21/4))/((21/4)-5))=21/((21/4)-(20/4))=21/(1/4)=21•4=84