Solve the equation: x+4x=27.
解方程：x+4x=27．
<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">27 / 5</gadget>
<output>27/5 = around 5.4</output>

<result>27/5 = around 5.4</result>