simplify the following in copy
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(2/3x + 4)(3/2x+6) - (1/7x-1)(1/7x+1)
=> x² + 4x + 6x + 24 - [ 1/49x² - 1²]
=> x² + 10x + 24 - 1/49x² + 1
=> x² - x²/49 + 10x + 25
=> 48x²/49 + 10x + 25
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