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-3(b+4)=-3
We move all terms to the left:
-3(b+4)-(-3)=0
We add all the numbers together, and all the variables
-3(b+4)+3=0
We multiply parentheses
-3b-12+3=0
We add all the numbers together, and all the variables
-3b-9=0
We move all terms containing b to the left, all other terms to the right
-3b=9
b=9/-3
b=-3
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