What is the result of subtracting the sum of (1/10) and (1/8) from 0.4 and multiplying by 40
0.4减去(1/10)与(1/8)的和，再乘以40，结果是多少
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/10) + (1/8)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">0.4 - (9/40)</gadget>
<output>0.175</output>

<gadget id="calculator">0.175 * 40</gadget>
<output>7</output>

<result>7</result>