First distribute through the set of parentheses.
When we distribute, we multiply the number outside
times each of the terms located inside the set.
So we have -2(x) + -2(4) or -2x - 8.
Now we have -2x - 8 + 5x + 10.
Combine like terms → your numbers and your "x" terms.
-2x + 5x is 3x and -8 + 10 is 2.
So we have 3x + 2.
3x + 2 cannot be simplified any further.