Solve the equation: (x-0.4)*(3/5)=3.5*45%.
解方程：(x-0.4)*(3/5)=3.5*45%．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">0.4 * (3/5)</gadget>
<output>0.24</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">3.5 * (9/20)</gadget>
<output>1.575</output>

<gadget id="calculator">0.24 + 1.575</gadget>
<output>1.815</output>

<gadget id="calculator">1.815 / (3/5)</gadget>
<output>3.025</output>

<result>3.025</result>