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Ответ:

3x^{2} =75\x^{2} =frac{75}{3}\x^{2}  =25\x=5\\3x^{2} -78=0\x^{2} =frac{78}{3} \x^{2} =26\x=sqrt{26} \\-2sqrt{x} =-8\2sqrt{x} =8\sqrt{x} =4\x=2

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