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6(5b+7)=168
We move all terms to the left:
6(5b+7)-(168)=0
We multiply parentheses
30b+42-168=0
We add all the numbers together, and all the variables
30b-126=0
We move all terms containing b to the left, all other terms to the right
30b=126
b=126/30
b=4+1/5
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