Solve the equation: 5.5x-(1/2)x=6.4.
解方程：5.5x-(1/2)x=6.4．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5.5 - (1/2)</gadget>
<output>5</output>

<gadget id="calculator">6.4 / 5</gadget>
<output>1.28</output>

<result>1.28</result>