After adding c to the numerator and denominator of the fraction (2005/2007), the new fraction obtained is equal to (2009/2010), what is c?
分数(2005/2007)的分子和分母同时加上c后，所得的新分数等于(2009/2010)，求c是多少﹖
<gadget id="calculator">2_009 * 2_007</gadget>
<output>4_032_063</output>

<gadget id="calculator">2_010 * 2_005</gadget>
<output>4_030_050</output>

<gadget id="calculator">4_032_063 - 4_030_050</gadget>
<output>2_013</output>

<result>2_013</result>