Solve for f (complex solution)
\left\{\begin{matrix}\\f=4\text{, }&\text{unconditionally}\\f\in \mathrm{C}\text{, }&x=0\end{matrix}\right.
Solve for x (complex solution)
\left\{\begin{matrix}\\x=0\text{, }&\text{unconditionally}\\x\in \mathrm{C}\text{, }&f=4\end{matrix}\right.
Solve for f
\left\{\begin{matrix}\\f=4\text{, }&\text{unconditionally}\\f\in \mathrm{R}\text{, }&x=0\end{matrix}\right.
Solve for x
\left\{\begin{matrix}\\x=0\text{, }&\text{unconditionally}\\x\in \mathrm{R}\text{, }&f=4\end{matrix}\right.
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xf=4x
The equation is in standard form.
\frac{xf}{x}=\frac{4x}{x}
Divide both sides by x.
f=\frac{4x}{x}
Dividing by x undoes the multiplication by x.
f=4
Divide 4x by x.
fx-4x=0
Subtract 4x from both sides.
\left(f-4\right)x=0
Combine all terms containing x.
x=0
Divide 0 by -4+f.
xf=4x
The equation is in standard form.
\frac{xf}{x}=\frac{4x}{x}
Divide both sides by x.
f=\frac{4x}{x}
Dividing by x undoes the multiplication by x.
f=4
Divide 4x by x.
fx-4x=0
Subtract 4x from both sides.
\left(f-4\right)x=0
Combine all terms containing x.
x=0
Divide 0 by -4+f.
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