Solve the equation: (2/5)(x-3)=(1/10).
解方程：(2/5)(x-3)=(1/10)．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 3</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(6/5) + (1/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">(13/10) / (2/5)</gadget>
<output>13/4 = around 3.25</output>

<result>13/4 = around 3.25</result>