Simple calculation: 660-630/6*5.
简算：660-630/6*5．
<gadget id="calculator">630 / 6</gadget>
<output>105</output>

<gadget id="calculator">105 * 5</gadget>
<output>525</output>

<gadget id="calculator">660 - 525</gadget>
<output>135</output>

<result>135</result>