Ответ(ы) на вопрос:
Гость[latex]\frac{\frac23}{\frac49x-\frac49}+\frac1{20}=\frac45\\\frac{\frac23}{\frac49(x-1)}=\frac45-\frac1{20}\\\frac{2\cdot9}{4\cdot3(x-1)}=\frac{16}{20}-\frac1{20}\\\frac{3}{2(x-1)}=\frac{15}{20}\\\frac{3}{2(x-1)}=\frac34\\6(x-1)=12\\6x-6=12\\6x=18\\x=3[/latex]
Гость(2/3)/(4/9х-4/9)+1/20=4/5
(40/3+4/9х-4/9)/(80/9х-80/9)=4/5
200/3+20/9х-20/9=320/9х-320/9
20/9х-320/9х=-580/9-320/9
-300/9х=-900/9
х=-900/9:(-300/9)
х=3
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