Students play a guessing game. Xiaoling said: "Multiply 9 by the number I thought and add 6.15 to equal 15.87." Do you know what number Xiaoling thinks of? (solution by equation method)
同学们玩猜数游戏．小玲说："用我想的数乘9再加上6.15等于15.87．"你知道小玲心里想的数是多少吗？(用方程方法解)
<gadget id="calculator">15.87 - 6.15</gadget>
<output>9.72</output>

<gadget id="calculator">9.72 / 9</gadget>
<output>1.08</output>

<result>1.08</result>