Solve for f_1
f_{1}=0
Solve for f_3 (complex solution)
f_{3}\in \mathrm{C}
f_{1}=0
Solve for f_3
f_{3}\in \mathrm{R}
f_{1}=0
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\frac{1}{3}f_{1}+f_{3}=f_{3}
Swap sides so that all variable terms are on the left hand side.
\frac{1}{3}f_{1}=f_{3}-f_{3}
Subtract f_{3} from both sides.
\frac{1}{3}f_{1}=0
Combine f_{3} and -f_{3} to get 0.
f_{1}=0
Product of two numbers is equal to 0 if at least one of them is 0. Since \frac{1}{3} is not equal to 0, f_{1} must be equal to 0.
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