Which of these people took part in the Pan-African Conference of 1900? A.) Queen Victoria

B.) James Weldon Johnson

C.) Booker T. Washington

D.) W. E. B. Du Bois

The answer is D.) W. E. B. Du Bois

c) troops march forward in close formation against newer, more accurate weapons

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