Solve the equation: 3x+2.8x=24.8.
解方程：3x+2.8x=24.8．
<gadget id="calculator">3 + 2.8</gadget>
<output>5.8</output>

<gadget id="calculator">24.8 / 5.8</gadget>
<output>4.275862</output>

<result>4.275862</result>