Solve for P_4, a, n, P_2, b
P_{4}=12\text{, }a=0\text{, }n\in \mathrm{R}\text{, }P_{2}=0\text{, }b=0
P_{4}=12\text{, }a=P_{2}n\text{, }n=\frac{b}{P_{2}}\text{, }P_{2}\neq 0\text{, }b\in \mathrm{R}
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