<math display='block'>
<mfenced open='{' close='}' separators=''><mroot><msqrt><msqrt><mn>1</mn><mo>+</mo><msqrt><mn>1</mn><mo>+</mo><msqrt><mn>1</mn><mo>+</mo><mi>x</mi></msqrt></msqrt></msqrt></msqrt><mn>3134</mn></mroot></mfenced>
</math>