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3x²+14-49=0 ⇒ (x +7)(3x-7)=0
                             x+7=0              3x-7=0
                             x+7-7=0-7       3x-7+7=0+7
                             x= -7                 \frac{3x}{3} = \frac{7}{3}
                                                     x= \frac{7}{3}

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