196/28-21, the order of the numbers remains the same, if it is to be changed to calculate subtraction first, then divide, what should be changed in the formula.
196/28-21，数的顺序不变，要改变成先算减法，再算除法，算式应该改为多少．
<gadget id="calculator">28 - 21</gadget>
<output>7</output>

<gadget id="calculator">196 / 7</gadget>
<output>28</output>

<result>28</result>