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Q: What is 4x minus 4x?

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It is possible.

7

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Let 6x - 2x - 9 = a, where a is an arbitrary constant. Then 4x - 9 = a 4x = a+9 x = (a+9)/4

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(2x - 1)(4x + 1)

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3x - 5x + 4x = -2x +4x = 2x

minus 1

x = 2