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139=6b+1
We move all terms to the left:
139-(6b+1)=0
We get rid of parentheses
-6b-1+139=0
We add all the numbers together, and all the variables
-6b+138=0
We move all terms containing b to the left, all other terms to the right
-6b=-138
b=-138/-6
b=+23
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