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27b=54-45b
We move all terms to the left:
27b-(54-45b)=0
We add all the numbers together, and all the variables
27b-(-45b+54)=0
We get rid of parentheses
27b+45b-54=0
We add all the numbers together, and all the variables
72b-54=0
We move all terms containing b to the left, all other terms to the right
72b=54
b=54/72
b=3/4
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