Who were the "sea dogs"?

The sea dogs, as they were disparagingly called by the Spanish authorities, were privateers who, with the consent and sometimes financial support of Elizabeth I of England (r. 1558-1603 CE), attacked and plundered Spanish colonial settlements and treasure ships in the second half of the 16th century CE.

Explanation:

b. sec, foreign relations

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