х-х^2<0
x<x^2
0<x
x>0
7x-x^2>=0
7x>=x^2
7>=x
x<=7
5x-x^2>0
5x>x^2
5>x
x<5
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х-х^2<0
x<x^2
0<x
x>0
7x-x^2>=0
7x>=x^2
7>=x
x<=7
5x-x^2>0
5x>x^2
5>x
x<5