Why was the laramie treaty a failure?

The government eventually broke the terms of the treaty following the Black Hills Gold Rush and an expedition into the area by George Armstrong Custer in 1874, and failed to prevent white settlers from moving onto tribal lands. Rising tensions eventually led again to open conflict in the Great Sioux War of 1876.

(I hope this helps ^^)

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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