Найди корни уравнения 7x^2+20x−5=0.

x1=−10+135−−−√10;x2=−10−135−−−√10
x1=−10+135−−−√7;x2=−10−135−−−√7
x1=−10+−135−−−−−√7;x2=−10−−135−−−−−√7
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