What helped resolve the issue of sanitation in overcrowded cities in Rome?

roads

aqueducts

public baths

sewer systems

ANSWER FAST

no every country is held to the same degree as others just some member countries such as the usa and germany are more economically sound so the need to show there support to all others  

8 - (2a + 7) = a + 40     distribute/multiply - into (2a + 7)

8 - 2a - 7 = a + 40

1 - 2a = a + 40       add 2a on both sides

1 = 3a + 40         subtract 40 on both sides

-39 = 3a       divide 3 on both sides

-13 = a

[proof]

8 - (2a + 7) = a + 40

8 - (2(-13) + 7) = -13 + 40

8 - (-26 + 7) = 27

8 - (-19) = 27

8 + 19 = 27

27 = 27

cuba is a multi-ethnic nation