The difference between 8 times of a certain number and its 5 times is equal to 135. Find this number.
某数的8倍与它的5倍的差等于135，求这个数．
<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">135 / 3</gadget>
<output>45</output>

<result>45</result>