For a math test, Xiao Min spent (2/3) hours preparing the test paper and (1/4) hour checking the test paper. At this time, there are still (7/12) hours before the end of the test. How many hours are required for this math test?
一次数学试卷，小敏做试卷用去(2/3)小时，检查试卷用去(1/4)小时，这时离考试结束还有(7/12)小时．这次数学考试规定时间是多少小时？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">(2/3) + (1/4) + (7/12)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>