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-3x-15=45 what does x equal

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

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Parviz F. | Mathematics professor at Community CollegesMathematics professor at Community Colle...
4.8 4.8 (4 lesson ratings) (4)
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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
   

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Carol E. | Skilled Math, Test Prep, Reading, and Writing TutorSkilled Math, Test Prep, Reading, and Wr...
4.6 4.6 (326 lesson ratings) (326)
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-3x-15=45
-3x-15+15=45+15
-3x=60
-3x/-3=60/-3
x=-20