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[tex]64x ^{2} - 128 = 0 \\ {64x}^{2} = 0 + 128 \\ {64x}^{2} = 128 \div 64 \\ {x}^{2} = 2 \\ x = \sqrt{2} \: \: o \: \: \: x = - \sqrt{2} [/tex]
