On February 1 1778 how many soldiers where sick what was the percentage of them

Total soldiers at Valley Forge: December 1777- 12,000 soldiers  February 1778-8,000 soldiers. Illness estimates during encampment: December 23, 1777- 2,898 soldiers,  February 1, 1778- 3,989 soldiers. Death estimates due to illness: December-June 1,800 to 2,500.  

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

if it were me, i would pick c. c is the best answer because it's basically saying go on a non-violent strike for india