If 4x+5=8.6, what is the value of 4-2x
若4x+5=8.6，则4-2x的值是多少
<gadget id="calculator">8.6 - 5</gadget>
<output>3.6</output>

<gadget id="calculator">3.6 / 4</gadget>
<output>0.9</output>

<gadget id="calculator">2 * 0.9</gadget>
<output>1.8</output>

<gadget id="calculator">4 - 1.8</gadget>
<output>2.2</output>

<result>2.2</result>