How do u simplify 4b - 7 - 15b + 3

4b-15b=-11b - 4 You want to simplify the common numbers and letters so 4b and 15b are common and there is a subtraction sign then then 7 and 3there is a additon sign but before the 7 there is a subtraction sign which makes it negative 7 so - 7+3=-4

4b - 7 - 15b + 3

4b - 15b - 7 + 3

-11b - 4