,

Substitute for .

Subtract from both sides of the equation.

Subtract from .

Divide each term in by .

Cancel the common factor of .

Cancel the common factor.

Divide by .

Divide by .

Solve f(x)=x+4 , f(x)=3x

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# Solve f(x)=x+4 , f(x)=3x

,

Substitute for .

Subtract from both sides of the equation.

Subtract from .

Divide each term in by .

Cancel the common factor of .

Cancel the common factor.

Divide by .

Divide by .

Solve f(x)=x+4 , f(x)=3x