\left. \begin{array} { l } { a _ { 1 } = - 2 d d } \\ { a _ { 4 } = - 2 a } \end{array} \right.
Solve for a_1, d, a_4, a
a_{1}=-2d^{2}
d\in \mathrm{R}
a_{4}=-2a
a\in \mathrm{R}
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