Which of the following countries succeeded in gaining independence as a result of revolutions in 1830?
a. belgium
c. hungary
b. poland
d. italy user: leader who dominated austrian politics for more than 30 years

Option A.

Explanation:

Belgium, is the right answer.

After a set of incidents, the revolution outburst in Brussels in the year 1830. Several troops were sent by William I but they were ousted on 27th September 1830. The insurgents gained support from enlistees outside the town. With this uprising, Belgium insulated from the Northern Netherlands. Later, on 4th October 1830, a provisional government in Belgium declared its independence.

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

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answer first choice