It is known that ((x)/9), ((y)/15), ((z)/14) are the simplest true fractions, and their product is (1/6), then x+y+z= How many.
已知((x)/9)，((y)/15)，((z)/14)都是最简真分数，并且他们的乘积是(1/6)，则x+y+z=多少．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">5 + 7 + 9</gadget>
<output>21</output>

<result>21</result>