Add parentheses to the formula 7*9+12/3=25 to make the left and right sides of the equal sign equal. What is the correct result?
给式子7*9+12/3=25加上括号，使等号左右两边相等，正确的结果是多少．
<gadget id="calculator">7 * 9</gadget>
<output>63</output>

<gadget id="calculator">63 + 12</gadget>
<output>75</output>

<gadget id="calculator">75 / 3</gadget>
<output>25</output>

<result>25</result>