86.25-(19.8-3.75)-4.2.
86.25-(19.8-3.75)-4.2．
<gadget id="calculator">19.8 - 3.75</gadget>
<output>16.05</output>

<gadget id="calculator">86.25 - 16.05 - 4.2</gadget>
<output>66</output>

<result>66</result>