The sum of the four numbers A, B, C, and D is equal to 134. It is known that the sum of A plus 1, the difference between B minus 2, the product of C multiplied by 3, and the quotient of D divided by 4 are all equal to the same number, what is the number.
甲、乙、丙、丁四个数的和等于134，已知甲数加上1的和，乙数减去2的差，丙数乘3的积，丁数除以4的商都等于同一个数，则这个数是多少．
<gadget id="calculator">1 - 2</gadget>
<output>-1</output>

<gadget id="calculator">134 + (-1)</gadget>
<output>133</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">3 + 3 + 1 + 12</gadget>
<output>19</output>

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

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<result>21</result>