To factor the expression \(35x - 40\) completely, we first look for the greatest common factor (GCF) of the two terms.
The GCF of \(35\) and \(40\) is \(5\).
Now we can factor out \(5\) from both terms:
\[ 35x - 40 = 5(7x - 8) \]
Thus, the completely factored form of the expression is:
\[ 5(7x - 8) \]