How was the Mississippi River vital to the French settlers of Louisiana? A) It provided the French with a defensive line against the English.
B) It was a major source of gold and other mineral resources for the French.
C) It was a boundary between French and Spanish territory.
D) It served as a link between New Orleans and French settlements further north.

simplify brackets

8 - 2a - 7 = a + 40

simplify 8 - 2a - 7 to -2a + 1

-2a + 1 = a + 40

add 2a to both sides

1 = a + 40 + 2a

simplify a + 40 + 2a to 3a + 40

1 = 3a + 40

subtract 40 from both sides

1 - 40 = 3a

simplify 1 - 40 o -39

-39 = 3a

divide both sides by 3

-39/3 = a

simplify 39/3 to 13

-13 = a

switch sides

a = -13

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.