Neither the brackets nor parenthesis seem to be purposeful, so we can eliminate those...
Then, we can combine like terms...
2x and -4x are like terms. While it is true that we are subtracting 4x, it is also true that subtraction is addition of a negative number.
-5 and 3 are also like terms.
We can simplify even more...
In these equations, the parenthesis are useful in that they tell us that the coefficient of -2 or 2 must be multiplied by unified parenthetical numbers.
I hope this helps. If not, please let me know.