Solve by completing the square

x^2+3/2x=3

What is the solution?

x=

Didn't I do this last night? If it was you who asked the question, check my previous response.

The "square" you want to create is
(x^2 + 3/2 x + 9/16) = (x + 3/4)^2

Take it from there, or read my previous answer.