can you tell me my mistake in this answer and correct it
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the last one
Electricity cannot itself be stored on any scale, but it can be converted to other forms of energy which can be stored and later reconverted to electricity on demand. Storage systems for electricity include battery, flywheel, compressed air, and pumped hydro storage.
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Explanation:
Your first step after the question is wrong
it would be
x-7-x-4 / ( x+4)(x-7]
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