It is important to a difficult chapter. a. memorize c. summarize b. read to the end d. none of these

The correct answer is option b. "Read to the end". In order to really understand a difficult chapter, it is important to not skip any section of the chapter, and it is important to read it to the end. Most of the time difficult chapters contain a lot of information and it is important to read all the content in order to completely understand it.

nicely as to join and when they said no punch them in the face and run away

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