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Verified Answer :

  1. −3(b−4)=−2b
     =     −3b+12=−2b
     =     −3b+12+2b=−2b+2b = −b+12=0
     =     −b+12−12=0−12 = −b=−12
     =     −b−1=−12−1
          b=12
XianLin

Since skatergirl has already done question 4, here is the solution for question 5. Feel free to ask if you are unsure of any step! :)

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