\[\boxed{\text{986\ (986).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[a_{14} = 140,\ \ S_{14} = 1050.\]
\[S_{14} = \frac{2a_{1} + 13d}{2} \cdot 14 = 1050.\]
\[Ответ:a_{1} = 10,\ \ d = 10.\]