2х²+14х-2(х²+2х-7х-14)-(х²+7х+2х+14)=2х²+14х-2х²-4х+14х+28-х²-7х-2х-14=2х²-2х²-х²+14х-4х+14х-7х-2х+28-14=
= -х²+15х+14
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2х²+14х-2(х²+2х-7х-14)-(х²+7х+2х+14)=2х²+14х-2х²-4х+14х+28-х²-7х-2х-14=2х²-2х²-х²+14х-4х+14х-7х-2х+28-14=
= -х²+15х+14