The common difference of the A.P. \(b_{1},b_{2},\ldots.,b_{m}\) is 2 more than the common difference of A.P. \(a_{1},a_{2},\ldots,a_{n}\). If \(a_{40} = - 159,a_{100} = - 399\) and \(b_{100} = a_{70}\), then \(b_{1}\) is equal to