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(2x-3)(2x-3)-(y+7)(y+7) =
(2x²-6x-6x+9)-(y²+7y+7y+49) =
(2x²-12x+9)-(y²+14y+49) =
2x²-12x-y²+14y+(9-49) =
2x²-12x-y²+14y-40 ..
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