8x-1.2x=27.2, among the following numbers, how much is the solution of the equation.
8x-1.2x=27.2，在下列各数中，多少是方程的解．
<gadget id="calculator">8 - 1.2</gadget>
<output>6.8</output>

<gadget id="calculator">27.2 / 6.8</gadget>
<output>4</output>

<result>4</result>