It is known that 2x+0.7=1.6, so how much is 4x+2*0.8=
已知2x+0.7=1.6，那么4x+2*0.8=多少
<gadget id="calculator">1.6 - 0.7</gadget>
<output>0.9</output>

<gadget id="calculator">0.9 / 2</gadget>
<output>0.45</output>

<gadget id="calculator">4 * 0.45</gadget>
<output>1.8</output>

<gadget id="calculator">2 * 0.8</gadget>
<output>1.6</output>

<gadget id="calculator">1.8 + 1.6</gadget>
<output>3.4</output>

<result>3.4</result>