Dad fell in love with a computer two months ago, but he didn't buy it because the price was too expensive. During the promotion on New Year's Day, the price of this computer was reduced by 1/4, and Dad bought it back for only 5,850 yuan. How much did this computer originally cost? (solution by equation)
两个月前爸爸看上了一台电脑，但因价格太贵没买．元旦促销活动中，这种电脑降价(1/4)，爸爸只花5850元就买回来了，这种电脑原来卖多少钱？(用方程解)
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">5_850 / (3/4)</gadget>
<output>7_800</output>

<result>7_800</result>