-3x-15=45 what does x equal

Question

What does x equal  i understand how to get the answer but i get confused if i subtract -3x from 45 or 15 from 45

Answer 1

Simple:

 

  -3X - 15 = 45

 

   Add 15 to both sides: move -15 to other side with changing the sign.

 

    -3X = 15 + 45 = 60

 

      X = 60/-3 = -20

   

Answer 2

-3x-15=45

-3x-15+15=45+15

-3x=60

-3x/-3=60/-3

x=-20