<math> <mi>x</mi> <mo>=</mo> <mfrac> <mrow> <mo>-</mo> <mi>b</mi> <mo>±</mo> <msqrt> <msup> <mrow> <mi>b</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> <mo>-</mo> <mn>4</mn> <mi>a</mi> <mi>c</mi> </msqrt> </mrow> <mrow> <mn>2</mn> <mi>a</mi> </mrow> </mfrac> </math>
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