sentences:  It is named after and including the Sydney suburb of Seven Hills.The second incarnation of Seven Hills largely consisted of areas from the abolished seat of Toongabbie, which had historically been a Labor stronghold before Labor's near-meltdown in west Sydney saw the Labor margin reduced from a comfortably safe 14.5 percent to an extremely marginal 0.3 percent.The transfer of traditionally pro-Labor voting areas to Blacktown and Prospect, and the addition of equally pro-Liberal areas from Baulkham Hills significantly altered the political composition of the electorate, giving the Liberals a notional margin of 8.8 percent–on the stronger side of fairly safe.