,

Set up the composite result function.

Evaluate by substituting in the value of into .

Factor out of .

Factor out of .

Factor out of .

Factor out of .

Factor out of .

Cancel the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Divide by .

Add and .

Add and .

Find g(f(x)) f(x)=3x-3 , g(x)=(x+3)/3