12^2-(х+7)^2-(5-х)(19+х)=
=12х^2-х^2-14х-49-95+14х+х^2=12х^2-144=
=12(х^2-12)
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12^2-(х+7)^2-(5-х)(19+х)=
=12х^2-х^2-14х-49-95+14х+х^2=12х^2-144=
=12(х^2-12)