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3a > 30
a > 10
Hp = { a | a > 10, a ∈ real}
2) 12a < 3a + 45
9a < 45
a < 5
Hp = { a | a < 5, a ∈ real}
3) 18a - 10 < 12a + 20
6a < 30
a < 5
Hp = { a | a < 5, a ∈ real}