Solve for f
\left\{\begin{matrix}\\f=-1\text{, }&\text{unconditionally}\\f\in \mathrm{R}\text{, }&n=0\end{matrix}\right.
Solve for n
\left\{\begin{matrix}\\n=0\text{, }&\text{unconditionally}\\n\in \mathrm{R}\text{, }&f=-1\end{matrix}\right.
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fn=-n
Subtract n from both sides. Anything subtracted from zero gives its negation.
nf=-n
The equation is in standard form.
\frac{nf}{n}=-\frac{n}{n}
Divide both sides by n.
f=-\frac{n}{n}
Dividing by n undoes the multiplication by n.
f=-1
Divide -n by n.
\left(f+1\right)n=0
Combine all terms containing n.
n=0
Divide 0 by f+1.
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