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19=2b+7
We move all terms to the left:
19-(2b+7)=0
We get rid of parentheses
-2b-7+19=0
We add all the numbers together, and all the variables
-2b+12=0
We move all terms containing b to the left, all other terms to the right
-2b=-12
b=-12/-2
b=+6
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