To complete the equation \(4x + 10 = _x + _\) so that it has infinite solutions, we need to ensure that both sides of the equation are equivalent expressions.
One way to do this is by re-arranging the left side to mirror the right side.
Let's set:
\[ 4x + 10 = 4x + 10 \]
This means that we fill in the blanks with the same expression:
\[ 4x + 10 = 4x + 10 \]
So, we can fill in the blanks:
\[ 4x + 10 = 4x + 10 \]
This completed equation has infinite solutions because any value of \(x\) will satisfy it.