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b+2=2b+7
We move all terms to the left:
b+2-(2b+7)=0
We get rid of parentheses
b-2b-7+2=0
We add all the numbers together, and all the variables
-1b-5=0
We move all terms containing b to the left, all other terms to the right
-b=5
b=5/-1
b=-5
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