Solve for r, F, a, b, c, d
r=\frac{b\left(a+2b\right)a^{2}}{F}\text{, }F\neq 0\text{, }a\neq 0\text{, }b\in \mathrm{R}\text{, }c=a-b\text{, }d=a-b
r\in \mathrm{R}\text{, }F=0\text{, }a\neq 0\text{, }b=0\text{, }c=a\text{, }d=a
r\in \mathrm{R}\text{, }F=0\text{, }a=-2b\text{, }b\neq 0\text{, }c=-3b\text{, }d=-3b
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