704 tons of cement were shipped to the construction site in two days, and the amount of cement shipped on the second day was 4 tons more than that on the first day (3/4). How many tons of cement were shipped on the first day? (solution by equation)
工地两天运来704吨水泥，第二天运来的水泥比第一天的(3/4)还多4吨，第一天运来多少吨水泥？(用方程解)
<gadget id="calculator">704 - 4</gadget>
<output>700</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 + (3/4)</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">700 / (7/4)</gadget>
<output>400</output>

<result>400</result>