Ответ:
2x+5x^2=0
x(2+5x)=0
x=0
2+5x=0
5x=-2
x=-2/5
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Ответ:
2x+5x^2=0
x(2+5x)=0
x=0
2+5x=0
x=0
5x=-2
x=0
x=-2/5