Chen Hua spent (3/4) hours drawing, which was (1/6) more hours than writing calligraphy. How many hours did it take to write calligraphy?
陈华画画用了(3/4)小时，比写毛笔字多用(1/6)小时，写毛笔字用了多少小时？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) - (1/6)</gadget>
<output>7/12 = around 0.583333</output>

<result>7/12 = around 0.583333</result>