Solve the equation: (83-x)-(x-(2/5)x)=3.
解方程：(83-x)-(x-(2/5)x)=3．
<gadget id="calculator">83 - 3</gadget>
<output>80</output>

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

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 + (3/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">80 / (8/5)</gadget>
<output>50</output>

<result>50</result>