Which was one cause of the revolution in Iran in 1978?
Some Iranians believed the government aligned too closely with Islamic values.
Some Iranians believed the government aligned too closely with Western values.
Iranians were opposed to the government's support of the nation of Israel.
Iranians were Sunnis and their government leaders were Shiites.

Iranian Revolution, also called Islamic Revolution, Persian Enqelāb-e Eslāmī, popular uprising in Iran in 1978–79 that resulted in the toppling of the monarchy on February 11, 1979, and led to the establishment of an Islamic republic.

Explanation: Step by step

letter d is correct.

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