The number ratio of the two track and field sports teams of the school is 4:3. If 5 players are transferred from the first team to the second team, the numbers of the two teams are equal. How many people were there in the first team?
学校两个田径运动队的人数比是4：3，如果从第一队调5人到第二队，则两队人数相等．第一队原来有多少人？
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(4/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">2 / (1/7)</gadget>
<output>14</output>

<gadget id="calculator">5 * 14 * (4/7)</gadget>
<output>40</output>

<result>40</result>