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To evaluate the expression, we substitute the given values of `a`, `b`, and `c` into the expression `3b-ac`:
`3b-ac = 3(3) - 2(-1.5)`
Simplifying,
`3b-ac = 9 + 3`
`3b-ac = 12`
Therefore, the value of the expression `3b-ac` when `a = 2`, `b = 3`, and `c = -1.5` is 12.