Solve for f
f=x^{3}-f_{4}+6
Solve for f_4
f_{4}=x^{3}-f+6
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f-3=x^{3}+3-f_{4}
Subtract f_{4} from both sides.
f=x^{3}+3-f_{4}+3
Add 3 to both sides.
f=x^{3}+6-f_{4}
Add 3 and 3 to get 6.
f_{4}-3=x^{3}+3-f
Subtract f from both sides.
f_{4}=x^{3}+3-f+3
Add 3 to both sides.
f_{4}=x^{3}+6-f
Add 3 and 3 to get 6.
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Limits
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