The product of x and 0.4 is 2 less than the quotient obtained by dividing 2.5 by 0.5, find x.
x与0.4的积比2.5除以0.5所得的商少2，求x．
<gadget id="calculator">2.5 / 0.5</gadget>
<output>5</output>

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">3 / 0.4</gadget>
<output>7.5</output>

<result>7.5</result>