The ancient Greek mathematician Diophantus was a world-famous mathematician, and an epitaph was engraved on her tombstone: "(1/6) of his life was a happy childhood; (1/12) of his life was lived again." ), a thin beard grew on both cheeks; there was one who spent his whole life (1/7), he got married; in another 5 years, he had a son and felt very happy; but the son only lived his full age After the death of her son, he spent 4 years in extreme pain and died. "Please calculate how old Diophantus lived?
古希腊数学家丢番图是著称于世的数学家，在她的墓碑上刻着一段墓志铭："他生命的(1/6)是幸福的童年；再活了他生命的(1/12)，两颊长起了细细的胡须；有度过了一生的(1/7)，他结婚了；再过5年，他有了儿子，感到很幸福；可是儿子只活了他全部年龄的一半，她儿子死后，他在极度痛苦中度过了4年，与世长辞了．"请你计算丢番图活了多少岁？
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/6) - (1/12) - (1/7) - (1/2)</gadget>
<output>3/28 = around 0.107143</output>

<gadget id="calculator">9 / (3/28)</gadget>
<output>84</output>

<result>84</result>