Imagine an old wool-making company in the middle of 19th century England using Jacquard loom weaving machines. The output Jacquard looms is given by the formula O(x) = – x2 + 18x + 12 where x is the amount of input (yarns of wool) used in the machines. What is the input level that corresponds to the highest output?

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A: given 4y-8=12

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A: Step 1: Step 2: Step 3: Step 4: