2=n-(2n+3)
pretend that there is a -1 in front of the bracket
2=n-1(2n+3)
multiply the bracket by -1
(-1)(2n)=-2n
(-1)(3)=-3
2=n-2n-3
2=-n-3
move -3 to the other side
sign changes from -3 to +3
2+3=-n-3+3
2+3=-n
5=-n
multiply both sides by -1 to get +n
5(-1)=-1(-n)
n=5(-1)=-5
Answer:
n=-5