Respuesta :

PEMDAS. (-4) - 18 - (12 + 3)

1. Parenthesis, simply what's in them.
(-4) -18 - (15)

2. Combine like terms.
-4 - 18 - 15 = -37

Hope this helped.
(-4) - 18 - (12+3)
-4 - 18 - 15
-37