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-19b+12=-18b
We move all terms to the left:
-19b+12-(-18b)=0
We get rid of parentheses
-19b+18b+12=0
We add all the numbers together, and all the variables
-1b+12=0
We move all terms containing b to the left, all other terms to the right
-b=-12
b=-12/-1
b=+12
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