Check How did geography affect the movement of people, goods, and ideas in ancient East Asia?
O It promoted exchange with other civilizations.
It led to expanding territories to the west beyond the Himalayas.
It made East Asia vulnerable to invasion from other civilizations.
It kept trade and cultural exchange mostly among groups within China.
Yes HELP

Answer is D

Explanation:

d because its right on edg

Explanation:

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