There is a pile of Go pieces, the number of white pieces is three times that of black pieces, each time take out 7 white pieces and 4 black pieces, after several times, there are 90 white pieces left, and the black pieces are taken, how many white pieces are there?
有一堆围棋子，白子颗数是黑子的3倍，每次拿出7颗白子，4颗黑子，经过若干次后，白子还剩90颗，黑子被拿完，原来白子有多少颗？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">12 - 7</gadget>
<output>5</output>

<gadget id="calculator">90 / 5</gadget>
<output>18</output>

<gadget id="calculator">7 * 18</gadget>
<output>126</output>

<gadget id="calculator">126 + 90</gadget>
<output>216</output>

<result>216</result>