Which statement describes a major industrial shift in Louisiana in the late 19th century? A) Reliance on steamboats decreased as railroad lines became more common.
B) Tobacco, cotton, and sugar cane became Louisiana's major crop exports.
C) Louisiana became the only state to manufacture military planes and equipment.
D) Almost all of Louisiana's farms were developed into neighborhoods and factories.

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explanation:

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

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