The school recently bought 4 computer desks and 5 chairs for a total of 1050 yuan. 90 yuan per chair, how much is each computer desk? (column equation solution)
学校最近买了4张电脑桌和5把椅子，共花去1050元．每把椅子90元，每张电脑桌多少元？(列方程解答)
<gadget id="calculator">90 * 5</gadget>
<output>450</output>

<gadget id="calculator">1_050 - 450</gadget>
<output>600</output>

<gadget id="calculator">600 / 4</gadget>
<output>150</output>

<result>150</result>