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-6(7-6b)=138
We move all terms to the left:
-6(7-6b)-(138)=0
We add all the numbers together, and all the variables
-6(-6b+7)-138=0
We multiply parentheses
36b-42-138=0
We add all the numbers together, and all the variables
36b-180=0
We move all terms containing b to the left, all other terms to the right
36b=180
b=180/36
b=5
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