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-3(b-15)=12b+30

We move all terms to the left:

-3(b-15)-(12b+30)=0

We multiply parentheses

-3b-(12b+30)+45=0

We get rid of parentheses

-3b-12b-30+45=0

We add all the numbers together, and all the variables

-15b+15=0

We move all terms containing b to the left, all other terms to the right

-15b=-15

b=-15/-15

b=1

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