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18b=19b-4
We move all terms to the left:
18b-(19b-4)=0
We get rid of parentheses
18b-19b+4=0
We add all the numbers together, and all the variables
-1b+4=0
We move all terms containing b to the left, all other terms to the right
-b=-4
b=-4/-1
b=+4
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