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-2(b-10)=2
We move all terms to the left:
-2(b-10)-(2)=0
We multiply parentheses
-2b+20-2=0
We add all the numbers together, and all the variables
-2b+18=0
We move all terms containing b to the left, all other terms to the right
-2b=-18
b=-18/-2
b=+9
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