The engineering team plans to build a road with a length of 300 meters per day, which can be completed in 18 days, but the whole project must be completed before the rainy season, and can be completed in 12 days. How many meters does the engineering team repair on average every day? (solution by equation)
工程队修一条公路，计划每天修300米，18天可以修完，但整个工程要赶在雨季前完成，能用12天完成．工程队平均每天要多修多少米？(用方程解)
<gadget id="calculator">300 * 18</gadget>
<output>5_400</output>

<gadget id="calculator">12 * 300</gadget>
<output>3_600</output>

<gadget id="calculator">5_400 - 3_600</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 / 12</gadget>
<output>150</output>

<result>150</result>