Solve for M
\left\{\begin{matrix}M=\frac{M_{1}}{6561s}\text{, }&s\neq 0\\M\in \mathrm{R}\text{, }&M_{1}=0\text{ and }s=0\end{matrix}\right.
Solve for M_1
M_{1}=6561Ms
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6561Ms=M_{1}
Swap sides so that all variable terms are on the left hand side.
6561sM=M_{1}
The equation is in standard form.
\frac{6561sM}{6561s}=\frac{M_{1}}{6561s}
Divide both sides by 6561s.
M=\frac{M_{1}}{6561s}
Dividing by 6561s undoes the multiplication by 6561s.
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