If a new operation a * b = AB / 2A + 3b is defined, then (- 3) * 1 =?

This problem is a set of formulas, such as a = - 3, B = 1
So (- 3) * 1 = - 3 * 1 / 2 * (- 3) + 3 * 1 = 3.5
Do 2A + 3B have brackets?
If so, here's the answer
（-3）*1=-3*1/【2*（-3）+3*1】=1
(the next person's answer is obviously wrong!)

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