Solve for a_3, a_4, S_5 (complex solution)
a_{3}=16-a_{4}
a_{4}\in \mathrm{C}
S_{5}=30
Solve for a_3, a_4, S_5
a_{3}=16-a_{4}
a_{4}\in \mathrm{R}
S_{5}=30
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