Question

What i want to know is what is -x=-3+2

Answer 1

Since x is negative you will have to make it positive by dividing it and each term on the right side by -1.
this will get you x=3-2
then you do 3-2 and get x=1

Answer 2

It's a linear equation in 'x'.  The solution to the equation is the number
that 'x' must be in order to make the equation a true statement. 

Fortunately, the equation is about as simple as it can be, so finding
the solution is really easy.

                                              -x = -3 + 2

First, clean up the right side.
Combine the -3 and the +2:    -x = -1

Multiply each side by -1:          x = 1