Expanding the left-hand side of the equation, we get:
-4(2x - 7) = -8x + [?]
-8x + 28 = -8x + [?]
We can see that -8x is already present on both sides of the equation, so the missing term is simply the constant 28. Therefore, the complete equation is:
-4(2x - 7) = -8x + 28