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-3(b+7)-4=20
We move all terms to the left:
-3(b+7)-4-(20)=0
We add all the numbers together, and all the variables
-3(b+7)-24=0
We multiply parentheses
-3b-21-24=0
We add all the numbers together, and all the variables
-3b-45=0
We move all terms containing b to the left, all other terms to the right
-3b=45
b=45/-3
b=-15
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