Solve for M
M=\frac{d_{1}r}{5}
Solve for d_1
\left\{\begin{matrix}d_{1}=\frac{5M}{r}\text{, }&r\neq 0\\d_{1}\in \mathrm{R}\text{, }&M=0\text{ and }r=0\end{matrix}\right.
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5M=rd_{1}
Swap sides so that all variable terms are on the left hand side.
5M=d_{1}r
The equation is in standard form.
\frac{5M}{5}=\frac{d_{1}r}{5}
Divide both sides by 5.
M=\frac{d_{1}r}{5}
Dividing by 5 undoes the multiplication by 5.
rd_{1}=5M
The equation is in standard form.
\frac{rd_{1}}{r}=\frac{5M}{r}
Divide both sides by r.
d_{1}=\frac{5M}{r}
Dividing by r undoes the multiplication by r.
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