Which undermined Lyndon Johnson's efforts to end poverty?
A. the refusal of civil rights leaders to support Johnson's programs
B. the decision by the Democratic Party not to nominate him for reelection
C. the massive cost and growing unpopularity of the Vietnam War
D. the rejection of his initiatives by the Republican majority in Congress

the massive cost and growing unpopularity of the Vietnam War

Explanation: I took the test

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

agree with wilson that weakening the treaty would threaten world peace.