what was the most significant contribution of gunnar mydral’s an American dilemma to the US civil rights movement?

The most significant contribution was definitely the inspiration that the Civil Rights movement got from it because it claimed empirically that in the end, democracy and equality will win over racism, and it was used even in court cases as a source for citations regarding verdicts. It showed many new ideas that were later used in creating affirmative action and racial integration processes.

Explanation:

8 - (2a + 7) = a + 40     distribute/multiply - into (2a + 7)

8 - 2a - 7 = a + 40

1 - 2a = a + 40       add 2a on both sides

1 = 3a + 40         subtract 40 on both sides

-39 = 3a       divide 3 on both sides

-13 = a

[proof]

8 - (2a + 7) = a + 40

8 - (2(-13) + 7) = -13 + 40

8 - (-26 + 7) = 27

8 - (-19) = 27

8 + 19 = 27

27 = 27