1.

5(3b-3) - 3(3b -7)=12

Answer» ONG>Answer:

At first OPEN the bracket

so,

15b -15-9B+21 =12

Now, 15b - 9b - 15+ 21 = 12

6b - 6 = 12

6b = 12-6

6b= 6

b = 6/6 = 1

Hence, b =1



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