There are two kinds of glass balls, red and white, in a box. The number of red balls is two more than three times the number of white balls. Take out 7 white balls and 15 red balls from the box each time. If after several times, there are only 3 white balls and 53 red balls left in the box, then how many more red balls than white balls are there in the box?
箱子里面有红、白两种玻璃球，红球数比白球数的3倍多两个，每次从箱子里取出7个白球，15个红球．如果经过若干次以后，箱子里只剩下3个白球，53个红球，那么，箱子里原有红球比白球多多少个．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">53 - 9 - 2</gadget>
<output>42</output>

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<gadget id="calculator">21 - 15</gadget>
<output>6</output>

<gadget id="calculator">42 / 6</gadget>
<output>7</output>

<gadget id="calculator">15 * 7</gadget>
<output>105</output>

<gadget id="calculator">7 * 7</gadget>
<output>49</output>

<gadget id="calculator">49 + 3</gadget>
<output>52</output>

<gadget id="calculator">53 - 52</gadget>
<output>1</output>

<gadget id="calculator">105 + 1</gadget>
<output>106</output>

<result>106</result>