Use deductive reasoning to show that the following procedure always produces the number 3. Procedure: Pick a number. Add 4 to the number and multiply the sum by 3. Subtract 9 and then decrease this difference by the triple of the original number. Pick a number.          n   Add 4 to the number.         n +   Multiply the sum by 3.          3   n +    = 3n +   Subtract 9.          3n + − 9 = 3n +   Subtract the triple of the original number.           3n + 3 − n = 3

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