Solve the equation: (4/5)x+(3/4)x-5=16+(1/2)x.
解方程：(4/5)x+(3/4)x-5=16+(1/2)x．
<gadget id="calculator">5 + 16</gadget>
<output>21</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/4) - (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(4/5) + (1/4)</gadget>
<output>21/20 = around 1.05</output>

<gadget id="calculator">21 / (21/20)</gadget>
<output>20</output>

<result>20</result>