After adding a pair of parentheses to the formula 7*9+12/3-2, what is the maximum value of the formula?
在算式7*9+12/3-2中加一对括号后，算式的最大值是多少
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">9 + 4</gadget>
<output>13</output>

<gadget id="calculator">7 * 13</gadget>
<output>91</output>

<gadget id="calculator">91 - 2</gadget>
<output>89</output>

<result>89</result>