98-(□-7.35)*0.15=8, □=how much.
98-(□-7.35)*0.15=8，□=多少．
<gadget id="calculator">98 - 8</gadget>
<output>90</output>

<gadget id="calculator">90 / 0.15</gadget>
<output>600</output>

<gadget id="calculator">600 + 7.35</gadget>
<output>607.35</output>

<result>607.35</result>