Solve the equation: 2(x+x+1)=9.8.
解方程：2(x+x+1)=9.8．
<gadget id="calculator">9.8 / 2</gadget>
<output>4.9</output>

<gadget id="calculator">4.9 - 1</gadget>
<output>3.9</output>

<gadget id="calculator">3.9 / 2</gadget>
<output>1.95</output>

<result>1.95</result>