Answer:
10x + 4
Step-by-step explanation:
Whenever you do situation like this you first have to do distributive property. 5 * 3x = 15x. 5 * 4 = 20. 5 * -x = -5x. Next, combine all like term. 15x - 5x = 10x. Finally, just place them together. 10x + 4.
Done
