Solve for a, Δ, b, c, d
a=c\text{, }\Delta =9\text{, }b\neq 0\text{, }c\neq 0\text{, }d=c
a=c\text{, }\Delta \in \mathrm{R}\text{, }b=0\text{, }c\neq 0\text{, }d=c
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