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Think of a number. Double it. Add six. Half it. Take away the number you started with. Your answer is 3.
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Think of a number. Double it. Add six. Half it. Take away the number you started with. Your answer is 3.

User Prhmma
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(x\cdot2+6)/2-x=3\\ (2x+6)/ 2-x=3\\ x+3-x=3\\ x-x=3-3\\ 0=0

That number can be any real number.
User Otake
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