Solve the equation: x-((3/4)+(1/5))=(2/5).
解方程：x-((3/4)+(1/5))=(2/5)．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/4) + (1/5) + (2/5)</gadget>
<output>27/20 = around 1.35</output>

<result>27/20 = around 1.35</result>