It is known that 5x+0.8=19.3, so how much is 2x-1.4=.
已知5x+0.8=19.3，那么2x-1.4=多少．
<gadget id="calculator">19.3 - 0.8</gadget>
<output>18.5</output>

<gadget id="calculator">18.5 / 5</gadget>
<output>3.7</output>

<gadget id="calculator">2 * 3.7</gadget>
<output>7.4</output>

<gadget id="calculator">7.4 - 1.4</gadget>
<output>6</output>

<result>6</result>