Verified Answer :

  1. -3(b-4)=-2b
        -3b+12=-2b
        12=-2b+3b
        12=b

    5. 7x+4/3=2x-1
       3(7x+4)=3(2x-1)
      21x+12=6x-3
      21x-6x=-3-12
      15x=-15
      x=-15/15
      x=-1

    6. 4x+12=-2(x+3)
       4x+12=-2x-6
       4x+2x=-6-12
       6x=-18
       x=-18/6
      x=-3

    7. 7-5x=10-(6x+7)
       7-5x=17-6x
       6x-5x=17-7
       x=10

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