Solve for a, b, c, m, d
a=4\text{, }b=0\text{, }c\in \mathrm{R}\text{, }m=0\text{, }d=0
a=4\text{, }b=8cm\text{, }c\in \mathrm{R}\text{, }m\neq 0\text{, }d=8cm
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