Factor out of .

Factor out of .

Factor out of .

Multiply by .

Subtract from .

Cancel the common factor.

Divide by .

Reduce (f(7)-f(3))/4

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# Reduce (f(7)-f(3))/4

Factor out of .

Factor out of .

Factor out of .

Multiply by .

Subtract from .

Cancel the common factor.

Divide by .

Reduce (f(7)-f(3))/4