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-7(1-6b)=-217
We move all terms to the left:
-7(1-6b)-(-217)=0
We add all the numbers together, and all the variables
-7(-6b+1)-(-217)=0
We add all the numbers together, and all the variables
-7(-6b+1)+217=0
We multiply parentheses
42b-7+217=0
We add all the numbers together, and all the variables
42b+210=0
We move all terms containing b to the left, all other terms to the right
42b=-210
b=-210/42
b=-5
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