PLZ HURRY IT'S MORE THAN ONE ANSWER Please select the things below that were the major difficulties for the pioneers moving west.

Question 6 options:

Laws restricting immigration

Native American attack

Injury and Disease

The Rocky Mountains

Threat of attack from foreign countries

the Native Americans attack's and injury and disease

Explanation:

those were the obstacles they experienced.

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