Solve for c
c\in \mathrm{R}
f=0
Solve for f
f=0
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\frac{\mathrm{d}}{\mathrm{d}x}(f)c=\frac{f\times 4-0}{4-0}
Anything times zero gives zero.
\frac{\mathrm{d}}{\mathrm{d}x}(f)c=\frac{f\times 4-0}{4}
Subtract 0 from 4 to get 4.
\frac{\mathrm{d}}{\mathrm{d}x}(f)c=f-0
Divide each term of f\times 4-0 by 4 to get f-0.
c\frac{\mathrm{d}}{\mathrm{d}x}(f)=f
Reorder the terms.
0=f
The equation is in standard form.
c\in
This is false for any c.
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