Formula: 1440/(90-21)+284. If the order of operations is changed to the quotient of 1440 divided by 90, and the sum of 284 and 21 is subtracted, what is the difference? what is the correct formula
算式：1440/(90-21)+284．如果把运算顺序改成1440除以90的商，减去284与21的和，差是多少？正确算式是多少
<gadget id="calculator">1_440 / 90</gadget>
<output>16</output>

<gadget id="calculator">284 + 21</gadget>
<output>305</output>

<gadget id="calculator">16 - 305</gadget>
<output>-289</output>

<result>-289</result>