This cartoon expresses the opinion that a) laborers should quit their jobs and join the military. b) a war will hurt the u. s. economy by depleting the workforce. c) the government must choose between supporting the workers or supporting the soldiers. d) citizens can support a war effort by joining the military or by giving their labor at home.

The answer is:

D) citizens can support a war effort by joining the military or by giving their labor at home.

Even though some cartoonists were in favor of war and others were against it, this First World War political cartoon suggests that everyone should get involved. Therefore, Uncle Sam is depicted as demanding people to either join the armed forces to fight or work hard to support the American military campaign.

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