20t+40t=240 1000/z+6z-2z=410 8800x-1600x=72000 y*(y-100)=0  (2800/x)*(700/x)=0   800d/200=800 (600-z)/z=14 1400g/(700g)=2 900u*(70-u)=2 85000/z*(1100-z)=850000 найди уравнение у которых нет решений
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