The most difficult problem with recycling water is that a. new pipes are needed to bring water to treatment plants. b. water evaporates very quickly in new mexico. c. public opinion tends to resist recycling efforts. d. there is no known technology to reuse water.

new pipes are needed to bring water to treatment plants.

ayatollah khomeini can best be described as the leader who declared iran to be an islamic republic.

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