The number of poplars in the park is 56 more than three times that of willows, and 84 less than four times that of willows. How many poplar trees are there in the park?
公园里的杨树棵数比柳树的3倍多56棵，且比柳树的4倍少84棵．公园里有杨树多少棵？
<gadget id="calculator">56 + 85</gadget>
<output>141</output>

<gadget id="calculator">141 * 3</gadget>
<output>423</output>

<gadget id="calculator">423 + 56</gadget>
<output>479</output>

<result>479</result>