Change the subject to a:
{(a + 1) / b} + 2 = 3a / b
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(a + 1) / b + 2 = 3a / b
⇒ (a + 1 + 2b) / b = 3a / b
⇒ a + 1 +2b = 3a
⇒ 1 + 2b = 3a - a
⇒ 1 + 2b =2a
⇒ (1 + 2b) / 2 = a
So, a = (1 + 2b) / 2
⇒ (a + 1 + 2b) / b = 3a / b
⇒ a + 1 +2b = 3a
⇒ 1 + 2b = 3a - a
⇒ 1 + 2b =2a
⇒ (1 + 2b) / 2 = a
So, a = (1 + 2b) / 2
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