![7x - 343x \sqrt[3]{} 7x - 343x \sqrt[3]{}](https://tex.z-dn.net/?f=+7x+-+343x+%5Csqrt%5B3%5D%7B%7D+)
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Step-by-step explanation:
7x-(7x)³
7x[1-(7x)²]
7x(1-49x²)
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