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-6(b+66)=72
We move all terms to the left:
-6(b+66)-(72)=0
We multiply parentheses
-6b-396-72=0
We add all the numbers together, and all the variables
-6b-468=0
We move all terms containing b to the left, all other terms to the right
-6b=468
b=468/-6
b=-78
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