\left\{ \begin{array} { l } { a _ { 1 } + 3 d = 10 } \\ { ( a _ { 1 } + 5 d ) ^ { 2 } = ( a _ { 1 } + 2 d ) ( a _ { 1 } + 9 d ) } \end{array} \right.
Solve for a_1, d
a_{1}=10\text{, }d=0
a_{1}=7\text{, }d=1
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