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-3(b+96)=-45
We move all terms to the left:
-3(b+96)-(-45)=0
We add all the numbers together, and all the variables
-3(b+96)+45=0
We multiply parentheses
-3b-288+45=0
We add all the numbers together, and all the variables
-3b-243=0
We move all terms containing b to the left, all other terms to the right
-3b=243
b=243/-3
b=-81
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