To simplify the expression, we can combine the real parts and the imaginary parts separately.
The real part is -3i + (3/4 + 2i) + (9/3 + 3i).
The imaginary part is -3i + (3/4 + 2i) + (9/3 + 3i).
Combining the real parts, we have 0 + 3/4 + 3 = 15/4.
Combining the imaginary parts, we have -3i + 2i + 3i = 2i.
Therefore, the complex number in standard form is 15/4 + 2i.