During Bill Clinton president's administration, the United States achieved the first budget surplus in 30 years.
They all stopped liking Eachother
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.