Solve the equation: ((0.75-x)/0.25+(2/5))*250%=6.5.
解方程：((0.75-x)/0.25+(2/5))*250%=6.5．
<gadget id="calculator">0.75 / 0.25</gadget>
<output>3</output>

<gadget id="calculator">250 / 100</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">3 * (5/2)</gadget>
<output>15/2 = around 7.5</output>

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

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

<gadget id="calculator">1 - 6.5</gadget>
<output>-5.5</output>

<gadget id="calculator">(15/2) + (-5.5)</gadget>
<output>2</output>

<gadget id="calculator">1 / 0.25</gadget>
<output>4</output>

<gadget id="calculator">4 * (5/2)</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>