Respuesta :

choixongdong
7b-15=5b-3 
2b = 12
  b = 6

hope it helps
ultimeslayer
add 15 to -3 and get 12
so you have 7b=5b+12
now subtract 5b out of 7b
you now have 2b=12
divide by 2b
so you should have b=6

Hope this helped! :)