There are two tanks of goldfish, if 15 goldfishes are taken out from the first tank and put into the second tank, then the goldfish in the first tank happens to be (5/7) of the second tank; if 17 goldfishes are taken out from the second tank and put People in the first tank, at this time the goldfish in the second tank happens to be from the first tank (5/7). How many goldfish were there in the first tank?
有两缸金鱼，如果从第一缸内取出15尾放入第二缸，这时第一缸内的金鱼正好是第二缸的(5/7)；如果从第二缸内取出17尾放人第一缸，这时第二缸内的金鱼也正好是第一缸的(5/7)．第一缸原有金鱼多少尾？
<gadget id="calculator">15 + 17</gadget>
<output>32</output>

<gadget id="calculator">5 + 7</gadget>
<output>12</output>

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

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(7/12) - (5/12)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">32 / (1/6)</gadget>
<output>192</output>

<gadget id="calculator">192 * (5/12)</gadget>
<output>80</output>

<gadget id="calculator">80 + 15</gadget>
<output>95</output>

<result>95</result>