Among the following numbers, x=how much is the solution of the equation 2.5x+3.4=6.4.
下面各数中，x=多少是方程2.5x+3.4=6.4的解．
<gadget id="calculator">6.4 - 3.4</gadget>
<output>3</output>

<gadget id="calculator">3 / 2.5</gadget>
<output>1.2</output>

<result>1.2</result>