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-b/3=18
We move all terms to the left:
-b/3-(18)=0
We multiply all the terms by the denominator
-b-18*3=0
We add all the numbers together, and all the variables
-1b-54=0
We move all terms containing b to the left, all other terms to the right
-b=54
b=54/-1
b=-54
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