<image>In ancient China's Ming Dynasty, a renowned mathematician Cheng Dawei recorded some poetic math problems in his book "Suanfa Tongzong". Among them, there is a "Hundred Sheep Problem": 

Jia drives a flock of sheep to the lush grass, Yi pulls a fat sheep following behind; Yi asks Jia whether he has one hundred sheep. Jia responds without error, saying: "If we had another such flock, plus half a flock, plus a quarter of a flock, and then add your one, we would have one hundred sheep." This means: Jia is driving a flock of sheep forward on the grassland, Yi is pulling a fat sheep closely behind. Yi asks Jia: "Do you have one hundred sheep in your flock?" Jia says: "If I had another flock like this one, plus half a flock, plus a quarter of the flock, and then add your one, we would have exactly 100 sheep." 

How many sheep did Jia originally drive? If Jia originally drove \( x \) sheep, we can set up the equation as ________________.

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