Solve the equation and check: 3x+4x=133.
解方程并检验：3x+4x=133．
<gadget id="calculator">3 * 19</gadget>
<output>57</output>

<gadget id="calculator">4 * 19</gadget>
<output>76</output>

<gadget id="calculator">57 + 76</gadget>
<output>133</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">133 / 7</gadget>
<output>19</output>

<result>19</result>