Respuesta :

2c + 3c + 4c - 5c - c = 15
Combine all like terms
3c = 15
Divide 3 on both sides
Final Answer: c = 5
1. combine all your like terms 
2 + 3 + 4 - 5 - 1 = 3
therefore:
3c = 15
c = 15/3
c = 5

hope this helps :)