Solve for a, b, y, c, d
y\in \mathrm{R}\text{, }a=\frac{3y+c+3b}{y+b}\text{, }b\neq -y\text{, }c\in \mathrm{R}\text{, }d=c
y\in \mathrm{R}\text{, }a\in \mathrm{R}\text{, }b=-y\text{, }c=0\text{, }d=0
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