Ax+3 = 7- bx what is x expressed in terms of a and b

Ax + 3 = 7 - bx
       -3  -3       
         ax = 4 - bx
  ax - ax = 4 - ax - bx
           0 = 4 - ax - bx
         -4    -4               
         -4 = -ax - bx

Yes you are right the correct answer is b

Sry i’m so bad at math! wish i could answer #imdumb