=[3x of(x-2)-x of(x+2)]×x of[(x+2)(x-2)]

=(x-2) point 3x×x point [(x+2)(x-2)]-(x+2) point x x point [(x+2)(x-2)]

=3(x+2)-(x-2)

=3x+6-x+2

=2x+8

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