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1 2x+1 + 2x = 2x+1 2x ( 2x+1 + 2x )( 2x+1 2x ) = 2x+1 2x ( 2x+1 ) 2 ( 2x ) 2 = 2x+1 2x 2x+12x = 2x+1 2x 1 = 2x+1 2x  

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