What is the solution of 10.5x+2x=20 x=
10.5x+2x=20的解是x=多少
<gadget id="calculator">10.5 + 2</gadget>
<output>12.5</output>

<gadget id="calculator">20 / 12.5</gadget>
<output>1.6</output>

<result>1.6</result>