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\frac{1}{4}fx+4=x
Swap sides so that all variable terms are on the left hand side.
\frac{1}{4}fx=x-4
Subtract 4 from both sides.
\frac{x}{4}f=x-4
The equation is in standard form.
\frac{4\times \frac{x}{4}f}{x}=\frac{4\left(x-4\right)}{x}
Divide both sides by \frac{1}{4}x.
f=\frac{4\left(x-4\right)}{x}
Dividing by \frac{1}{4}x undoes the multiplication by \frac{1}{4}x.
f=4-\frac{16}{x}
Divide x-4 by \frac{1}{4}x.
x-\frac{1}{4}fx=4
Subtract \frac{1}{4}fx from both sides.
\left(1-\frac{1}{4}f\right)x=4
Combine all terms containing x.
\left(-\frac{f}{4}+1\right)x=4
The equation is in standard form.
\frac{\left(-\frac{f}{4}+1\right)x}{-\frac{f}{4}+1}=\frac{4}{-\frac{f}{4}+1}
Divide both sides by 1-\frac{1}{4}f.
x=\frac{4}{-\frac{f}{4}+1}
Dividing by 1-\frac{1}{4}f undoes the multiplication by 1-\frac{1}{4}f.
x=\frac{16}{4-f}
Divide 4 by 1-\frac{1}{4}f.