Solve the equation: 2x-4x+140=94.
解方程：2x-4x+140=94．
<gadget id="calculator">140 - 94</gadget>
<output>46</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">46 / 2</gadget>
<output>23</output>

<result>23</result>