I got -5 & 2/5 because
2/3x and 3/5 can be made into
20/30x and 18/30
And then by adding 2 to -2
And adding 2 to 4
The equation becomes
20/30x + 6 = 18/30
Then I subtracted 6 from 18/30 and got
20/30x = -5 & 2/5
Then simplified that to
2/3x = -5 & 2/5
That's just what I think you should do.