Lös ut M
M=-\frac{126-12\times 45^{g}-\pi adr}{12\times 10^{g}}
Lös ut a
\left\{\begin{matrix}a=-\frac{6\left(-2M\times 10^{g}+2\times 45^{g}-21\right)}{\pi dr}\text{, }&r\neq 0\text{ and }d\neq 0\\a\in \mathrm{R}\text{, }&M=\frac{2\times 45^{g}-21}{2\times 10^{g}}\text{ and }\left(r=0\text{ or }d=0\right)\end{matrix}\right,
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