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Text 4 Although, recent years have seen substantial reductions in noxious pollutants from indiv...

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4x﹣y=0  4x﹣y+2=0或4x﹣y﹣2=0

  4x﹣y﹣2=0  4x﹣y=0或4x﹣y﹣4=0  

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3-2y-1-4y=2  3(1-2y)-4y=2

  3(2y-1)-4y=2  3-2y-4y=2  

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