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-11(b-13)=11
We move all terms to the left:
-11(b-13)-(11)=0
We multiply parentheses
-11b+143-11=0
We add all the numbers together, and all the variables
-11b+132=0
We move all terms containing b to the left, all other terms to the right
-11b=-132
b=-132/-11
b=+12
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